diff --git a/RFCP-Iteration-3.4.0-Large-Radius-Support.md b/RFCP-Iteration-3.4.0-Large-Radius-Support.md
new file mode 100644
index 0000000..881974d
--- /dev/null
+++ b/RFCP-Iteration-3.4.0-Large-Radius-Support.md
@@ -0,0 +1,439 @@
+# RFCP Iteration 3.4.0 — Large Radius Support (20-50km)
+
+## Goal
+
+Enable 50km radius calculations without OOM by implementing memory-efficient processing patterns.
+
+**Current limitation:** > 10-20km radius causes OOM (5+ GB RAM usage)
+**Target:** 50km radius with < 4GB RAM peak
+
+---
+
+## Phase 1: Memory-Mapped Terrain
+
+### 1.1 Terrain mmap Loading
+
+Change terrain_service to use memory-mapped files instead of loading full arrays into RAM.
+
+**File:** `backend/app/services/terrain_service.py`
+
+```python
+# Before (loads ~25 MB per tile into RAM):
+terrain = np.fromfile(f, dtype='>i2').reshape((rows, cols))
+
+# After (near-zero RAM, OS pages from disk):
+terrain = np.memmap(f, dtype='>i2', mode='r', shape=(rows, cols))
+```
+
+**Expected impact:** -200-400 MB RAM per tile
+
+### 1.2 Terrain Disk Cache
+
+- Save downloaded .hgt files to persistent disk cache
+- Don't keep raw arrays in memory after initial processing
+- Implement LRU eviction if cache exceeds 2GB
+- Location: `~/.rfcp/terrain_cache/`
+
+---
+
+## Phase 2: Tile-Based Processing
+
+### 2.1 Split Large Calculations
+
+If radius > 10km, split calculation area into 5km sub-tiles.
+
+**File:** `backend/app/services/coverage_service.py` (or new `tile_processor.py`)
+
+```python
+def calculate_coverage_tiled(site, radius_m, resolution_m, settings):
+    """Tile-based calculation for large radius."""
+    
+    # Small radius — use existing single-pass
+    if radius_m <= 10000:
+        return calculate_coverage_single(site, radius_m, resolution_m, settings)
+    
+    # Large radius — split into tiles
+    TILE_SIZE = 5000  # 5km tiles
+    tiles = generate_tile_grid(site.lat, site.lon, radius_m, TILE_SIZE)
+    
+    all_results = []
+    
+    for i, tile in enumerate(tiles):
+        log(f"Processing tile {i+1}/{len(tiles)}: {tile.bbox}")
+        
+        # Load data for this tile only
+        tile_terrain = load_terrain_for_bbox(tile.bbox)
+        tile_buildings = load_buildings_for_bbox(tile.bbox)
+        
+        # Calculate coverage for tile
+        tile_points = generate_grid_for_tile(tile, resolution_m)
+        tile_results = calculate_points(tile_points, site, settings,
+                                        tile_terrain, tile_buildings)
+        
+        all_results.extend(tile_results)
+        
+        # Free memory
+        del tile_terrain, tile_buildings
+        gc.collect()
+        
+        # Report progress
+        progress = (i + 1) / len(tiles) * 100
+        yield_progress(progress, f"Tile {i+1}/{len(tiles)}")
+    
+    return merge_and_dedupe_results(all_results)
+
+
+def generate_tile_grid(center_lat, center_lon, radius_m, tile_size_m):
+    """Generate grid of tiles covering the calculation area."""
+    tiles = []
+    
+    # Calculate bbox of full area
+    lat_delta = radius_m / 111000
+    lon_delta = radius_m / (111000 * cos(radians(center_lat)))
+    
+    # Generate tile grid
+    n_tiles = ceil(radius_m * 2 / tile_size_m)
+    
+    for i in range(n_tiles):
+        for j in range(n_tiles):
+            tile_bbox = calculate_tile_bbox(center_lat, center_lon, 
+                                           i, j, n_tiles, tile_size_m)
+            
+            # Only include tiles that intersect with coverage circle
+            if tile_intersects_circle(tile_bbox, center_lat, center_lon, radius_m):
+                tiles.append(Tile(bbox=tile_bbox, index=(i, j)))
+    
+    return tiles
+```
+
+### 2.2 Progressive Results via WebSocket
+
+Send results per-tile as they complete, so user sees coverage growing.
+
+**File:** `backend/app/api/websocket.py`
+
+```python
+async def calculate_coverage_ws(websocket, params):
+    for tile_results in calculate_coverage_tiled_generator(params):
+        # Send partial results
+        await websocket.send_json({
+            "type": "partial_results",
+            "points": tile_results.points,
+            "progress": tile_results.progress,
+            "tile": tile_results.tile_index,
+            "status": f"Tile {tile_results.tile_index} complete"
+        })
+    
+    # Final message
+    await websocket.send_json({
+        "type": "complete",
+        "total_points": total_points,
+        "computation_time": elapsed
+    })
+```
+
+---
+
+## Phase 3: SQLite Cache for OSM Data
+
+### 3.1 Create Local Database
+
+Replace in-memory OSM cache with SQLite database with spatial indexing.
+
+**File:** `backend/app/services/cache_db.py` (NEW)
+
+```python
+import sqlite3
+import json
+
+class OSMCacheDB:
+    def __init__(self, db_path="~/.rfcp/osm_cache.db"):
+        self.conn = sqlite3.connect(db_path)
+        self._init_tables()
+    
+    def _init_tables(self):
+        self.conn.executescript("""
+            CREATE TABLE IF NOT EXISTS buildings (
+                id INTEGER PRIMARY KEY,
+                osm_id TEXT UNIQUE,
+                lat REAL NOT NULL,
+                lon REAL NOT NULL,
+                height REAL DEFAULT 10.0,
+                geometry TEXT,  -- GeoJSON
+                cell_key TEXT,  -- grid cell for batch loading
+                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
+            
+            CREATE INDEX IF NOT EXISTS idx_buildings_lat ON buildings(lat);
+            CREATE INDEX IF NOT EXISTS idx_buildings_lon ON buildings(lon);
+            CREATE INDEX IF NOT EXISTS idx_buildings_cell ON buildings(cell_key);
+            
+            CREATE TABLE IF NOT EXISTS vegetation (
+                id INTEGER PRIMARY KEY,
+                osm_id TEXT UNIQUE,
+                lat REAL NOT NULL,
+                lon REAL NOT NULL,
+                type TEXT,
+                geometry TEXT,
+                cell_key TEXT
+            );
+            
+            CREATE INDEX IF NOT EXISTS idx_veg_lat ON vegetation(lat);
+            CREATE INDEX IF NOT EXISTS idx_veg_lon ON vegetation(lon);
+            
+            -- Metadata for cache invalidation
+            CREATE TABLE IF NOT EXISTS cache_meta (
+                cell_key TEXT PRIMARY KEY,
+                data_type TEXT,
+                fetched_at TIMESTAMP,
+                item_count INTEGER
+            );
+        """)
+        self.conn.commit()
+    
+    def query_buildings_bbox(self, min_lat, max_lat, min_lon, max_lon, limit=20000):
+        """Query buildings within bounding box."""
+        cursor = self.conn.execute("""
+            SELECT osm_id, lat, lon, height, geometry
+            FROM buildings
+            WHERE lat BETWEEN ? AND ?
+            AND lon BETWEEN ? AND ?
+            LIMIT ?
+        """, (min_lat, max_lat, min_lon, max_lon, limit))
+        
+        return [self._row_to_building(row) for row in cursor]
+    
+    def insert_buildings(self, buildings, cell_key):
+        """Bulk insert buildings from OSM fetch."""
+        self.conn.executemany("""
+            INSERT OR IGNORE INTO buildings 
+            (osm_id, lat, lon, height, geometry, cell_key)
+            VALUES (?, ?, ?, ?, ?, ?)
+        """, [
+            (b['id'], b['lat'], b['lon'], b.get('height', 10), 
+             json.dumps(b.get('geometry')), cell_key)
+            for b in buildings
+        ])
+        self.conn.commit()
+    
+    def is_cell_cached(self, cell_key, data_type, max_age_hours=24):
+        """Check if cell data is cached and fresh."""
+        cursor = self.conn.execute("""
+            SELECT fetched_at FROM cache_meta
+            WHERE cell_key = ? AND data_type = ?
+            AND fetched_at > datetime('now', ?)
+        """, (cell_key, data_type, f'-{max_age_hours} hours'))
+        
+        return cursor.fetchone() is not None
+```
+
+### 3.2 Update OSM Client
+
+Modify OSM client to use SQLite cache.
+
+**File:** `backend/app/services/osm_client.py`
+
+```python
+class OSMClient:
+    def __init__(self):
+        self.cache_db = OSMCacheDB()
+    
+    def get_buildings(self, bbox, max_count=20000):
+        min_lat, min_lon, max_lat, max_lon = bbox
+        cell_key = self._bbox_to_cell_key(bbox)
+        
+        # Check cache first
+        if self.cache_db.is_cell_cached(cell_key, 'buildings'):
+            return self.cache_db.query_buildings_bbox(
+                min_lat, max_lat, min_lon, max_lon, max_count
+            )
+        
+        # Fetch from Overpass API
+        buildings = self._fetch_from_overpass(bbox, 'buildings')
+        
+        # Store in cache
+        self.cache_db.insert_buildings(buildings, cell_key)
+        
+        return buildings[:max_count]
+```
+
+---
+
+## Phase 4: Worker Memory Optimization
+
+### 4.1 Per-Tile Building Loading
+
+Workers receive only tile bbox and query buildings themselves (or receive pre-filtered list).
+
+```python
+def _pool_worker_tiled(args):
+    """Worker that loads buildings for its tile only."""
+    tile_bbox, terrain_shm_refs, config = args
+    
+    # Load only buildings for this tile
+    cache_db = OSMCacheDB()
+    buildings = cache_db.query_buildings_bbox(*tile_bbox, limit=5000)
+    
+    # Much smaller memory footprint per worker
+    # ...rest of calculation
+```
+
+### 4.2 Adaptive Worker Count
+
+Reduce workers for large radius to prevent combined memory explosion.
+
+```python
+def get_worker_count_for_radius(radius_m, base_workers):
+    """Scale down workers for large calculations."""
+    if radius_m > 30000:
+        return min(base_workers, 2)
+    elif radius_m > 20000:
+        return min(base_workers, 3)
+    elif radius_m > 10000:
+        return min(base_workers, 4)
+    return base_workers
+```
+
+---
+
+## Phase 5: Frontend Progressive Rendering
+
+### 5.1 Accumulate Partial Results
+
+**File:** `frontend/src/store/coverage.ts`
+
+```typescript
+interface CoverageState {
+    points: CoveragePoint[];
+    isCalculating: boolean;
+    progress: number;
+    // NEW:
+    partialResults: CoveragePoint[];
+    tilesCompleted: number;
+    totalTiles: number;
+}
+
+// Handle partial results
+case 'partial_results':
+    set(state => ({
+        partialResults: [...state.partialResults, ...message.points],
+        progress: message.progress,
+        tilesCompleted: state.tilesCompleted + 1
+    }));
+    break;
+
+case 'complete':
+    set(state => ({
+        points: state.partialResults,  // Finalize
+        partialResults: [],
+        isCalculating: false
+    }));
+    break;
+```
+
+### 5.2 Incremental Heatmap Render
+
+**File:** `frontend/src/components/map/CoverageHeatmap.tsx`
+
+```typescript
+function CoverageHeatmap() {
+    const { points, partialResults, isCalculating } = useCoverageStore();
+    
+    // Show partial results while calculating
+    const displayPoints = isCalculating ? partialResults : points;
+    
+    // Throttle re-renders during streaming (every 500 points)
+    const throttledPoints = useThrottle(displayPoints, 500);
+    
+    return <HeatmapLayer points={throttledPoints} />;
+}
+```
+
+---
+
+## Implementation Order
+
+### Priority 1 — Biggest Impact
+1. **Tile-based processing** (Phase 2.1) — enables large radius
+2. **SQLite cache** (Phase 3) — reduces memory, speeds up repeated calcs
+
+### Priority 2 — Memory Reduction
+3. **Terrain mmap** (Phase 1.1) — easy win, minimal code change
+4. **Per-tile building loading** (Phase 4.1)
+
+### Priority 3 — UX Improvement
+5. **Progressive WebSocket** (Phase 2.2)
+6. **Frontend streaming** (Phase 5)
+
+### Priority 4 — Polish
+7. **Terrain disk cache** (Phase 1.2)
+8. **Adaptive worker count** (Phase 4.2)
+
+---
+
+## Success Criteria
+
+| Radius | Max Time | Max RAM |
+|--------|----------|---------|
+| 20 km  | < 3 min  | < 3 GB  |
+| 30 km  | < 5 min  | < 3.5 GB |
+| 50 km  | < 10 min | < 4 GB  |
+
+- No OOM crashes at any radius up to 50km
+- Progressive results visible within 30s of starting
+- Cache reuse speeds up repeated calculations 5-10x
+
+---
+
+## Files to Modify
+
+### Backend (Python)
+
+| File | Changes |
+|------|---------|
+| `terrain_service.py` | mmap loading, disk cache |
+| `coverage_service.py` | tile-based routing |
+| `parallel_coverage_service.py` | adaptive workers |
+| `osm_client.py` | SQLite integration |
+| `websocket.py` | streaming results |
+| **NEW** `tile_processor.py` | tile generation & processing |
+| **NEW** `cache_db.py` | SQLite cache layer |
+
+### Frontend (TypeScript)
+
+| File | Changes |
+|------|---------|
+| `store/coverage.ts` | partial results handling |
+| `CoverageHeatmap.tsx` | incremental rendering |
+| `App.tsx` | progress for tiled calc |
+
+---
+
+## Testing
+
+```bash
+# Test 20km radius
+curl -X POST http://localhost:8888/api/coverage/calculate \
+  -H "Content-Type: application/json" \
+  -d '{"radius": 20000, "resolution": 500, "preset": "standard"}'
+
+# Monitor memory
+watch -n 1 'ps aux | grep rfcp-server | awk "{print \$6/1024\" MB\"}"'
+
+# Test 50km radius
+curl -X POST http://localhost:8888/api/coverage/calculate \
+  -H "Content-Type: application/json" \
+  -d '{"radius": 50000, "resolution": 1000, "preset": "standard"}'
+```
+
+---
+
+## Notes
+
+- Tile size 5km is a balance — smaller = more overhead, larger = more memory
+- SQLite R-tree extension would be faster but requires compilation
+- For Rust version, all of this will be native and faster
+
+---
+
+*"Think in tiles, stream results, cache everything"* 🗺️
diff --git a/RFCP-Session-Summary-2025-02-01.md b/RFCP-Session-Summary-2025-02-01.md
deleted file mode 100644
index 3a3b16c..0000000
--- a/RFCP-Session-Summary-2025-02-01.md
+++ /dev/null
@@ -1,233 +0,0 @@
-# RFCP Development Session Summary
-## Date: February 1, 2025 (actually 2026)
-## Status: Phase 3.0 Complete, Performance Optimization Ongoing
-
----
-
-## 🎯 Project Overview
-
-**RFCP (Radio Frequency Coverage Planning)** — desktop application for tactical LTE network planning, part of UMTC (Ukrainian Military Tactical Communications) project.
-
-**Tech Stack:**
-- Backend: Python/FastAPI + NumPy + ProcessPoolExecutor
-- Frontend: React + TypeScript + Vite
-- Desktop: Electron
-- Build: PyInstaller (backend), electron-builder (desktop)
-
-**Goal:** Calculate RF coverage maps with terrain, buildings, vegetation analysis.
-
----
-
-## ✅ What Works (Phase 3.0 Achievements)
-
-### Performance
-| Preset | Before | After | Status |
-|--------|--------|-------|--------|
-| Standard (100-200m res) | 38s | **~5s** | ✅ EXCELLENT |
-| Detailed (300m, 5km) | timeout | timeout | ❌ Still broken |
-
-### Architecture (48 new files, 82 tests)
-- ✅ Modular propagation models (8 models: FreeSpace, Okumura-Hata, COST-231, ITU-R P.1546, etc.)
-- ✅ SharedMemoryManager for terrain data (zero-copy, 25 MB)
-- ✅ Building filtering (351k → 27k bbox → 15k cap)
-- ✅ WebSocket progress streaming (backend works)
-- ✅ Clean model selection by frequency/environment
-- ✅ Worker cleanup on shutdown
-- ✅ Overpass API retry with failover (3 attempts, mirror endpoint)
-
-### New Files Structure
-```
-backend/app/
-├── propagation/     # 8 model files
-├── geometry/        # 5 files (haversine, intersection, reflection, diffraction, los)
-├── core/            # 4 files (engine, grid, calculator, result)
-├── parallel/        # 3 files (manager, worker, pool)
-├── services/        # cache.py, osm_client.py
-├── utils/           # logging.py, progress.py, units.py
-└── api/websocket.py
-
-frontend/src/
-├── hooks/useWebSocket.ts
-├── services/websocket.ts
-└── components/FrequencyBandPanel.tsx
-```
-
----
-
-## ❌ Current Blockers
-
-### 1. Detailed Preset Timeout (CRITICAL)
-
-**Symptom:** 300s timeout, only 194/868 points calculated
-
-**Latest test results:**
-```
-[DOMINANT_PATH_VEC] Point #1: buildings=30, walls=214, dist=4887m
-302.8ms/point × 868 points = 262 seconds
-```
-
-**Root Cause Analysis:**
-- Early return fix (Claude Code) was for `buildings=[]` case
-- But in reality, buildings ARE present (15,000 after cap)
-- Each point finds 17-30 nearby buildings
-- Each building has 100-295 wall segments
-- **dominant_path_service** geometry calculations are expensive
-
-**The real problem is NOT "buildings=0 is slow"**
-**The real problem IS "dominant_path with buildings is inherently slow"**
-
-**Potential solutions:**
-1. Simplify building geometry (reduce wall count)
-2. Use spatial indexing more aggressively
-3. Skip dominant_path for distant points (>3km?)
-4. Reduce building query radius
-5. Use simpler path loss model when buildings present
-6. GPU acceleration (CuPy) for geometry
-
-### 2. Progress Bar Stuck at "Initializing 5%"
-
-**Symptom:** UI shows "Initializing 5%" forever
-
-**Fix attempted:** `await asyncio.sleep(0)` after progress_fn() — not working
-
-**Likely cause:** Frontend WebSocket connection or state update issue
-
-### 3. App Close Broken
-
-**Symptom:** Clicking X kills backend but frontend stays open
-
-**Partial fix:** Worker cleanup works, but Electron window doesn't close
-
-### 4. Memory Not Released
-
-**Symptom:** 1328 MB not freed after calculation
-```
-Before: 3904 MB free
-After:  2576 MB free
-```
-
----
-
-## 📊 Performance Analysis
-
-### Why Detailed is slow (the math):
-
-```
-Points: 868
-Buildings nearby per point: ~25 average
-Walls per building: ~150 average
-Wall intersection checks: 868 × 25 × 150 = 3,255,000
-
-At 0.1ms per check = 325 seconds
-```
-
-### Why Standard is fast:
-
-- Lower resolution = fewer points (~200 vs 868)
-- Likely skips some detailed calculations
-- Buildings still processed but fewer points to check
-
----
-
-## 🔧 Key Files to Review
-
-### Backend (performance critical)
-```
-backend/app/services/
-├── dominant_path_service.py    # THE BOTTLENECK
-├── coverage_service.py         # Orchestration, progress
-├── parallel_coverage_service.py # Worker management
-└── buildings_service.py        # OSM fetch, caching
-```
-
-### Frontend (UI bugs)
-```
-frontend/src/
-├── App.tsx                     # Progress display
-├── store/coverage.ts           # WebSocket state
-└── services/websocket.ts       # WS connection
-```
-
-### Desktop (close bug)
-```
-desktop/main.js                 # Electron lifecycle
-```
-
----
-
-## 🎯 Recommended Next Steps
-
-### Priority 1: Fix Detailed Performance
-
-**Option A: Aggressive spatial filtering**
-```python
-# In dominant_path_service.py
-# Only check buildings within line-of-sight corridor
-# Not all buildings within radius
-```
-
-**Option B: LOD (Level of Detail)**
-```python
-# Distance > 2km: skip dominant path entirely
-# Distance 1-2km: simplified model
-# Distance < 1km: full calculation
-```
-
-**Option C: Building simplification**
-```python
-# Reduce wall count per building
-# Merge adjacent buildings
-# Use bounding boxes instead of polygons for far buildings
-```
-
-### Priority 2: Fix UI Bugs
-- Debug WebSocket in browser DevTools
-- Check Electron close handler
-
-### Priority 3: Memory
-- Explicit cleanup after calculation
-- Check for leaked references
-
----
-
-## 📝 Session Timeline
-
-1. **Phase 2.4-2.5.1** — Vectorization attempt (didn't help)
-2. **Decision** — Full Phase 3.0 architecture refactor
-3. **Architecture Doc** — 1719 lines specification
-4. **Claude Code Round 1** — 48 files, 82 tests (35 min)
-5. **Integration Round** — WebSocket, progress, model selection (20 min)
-6. **Bug Fix Round** — Memory, workers, app close (15 min)
-7. **Claude Code Fix** — Dominant path early return, Overpass retry, progress (13 min)
-8. **Current** — Still timeout, need different approach
-
----
-
-## 💡 Key Insights
-
-1. **Vectorization alone doesn't help** — problem is algorithmic, not just numpy
-2. **SharedMemory works** — terrain in shared memory is efficient
-3. **Building count matters** — 351k→15k filtering helps but not enough
-4. **dominant_path is the bottleneck** — consistently 200-300ms/point
-5. **Standard preset proves architecture works** — fast when less work needed
-
----
-
-## 🔗 Related Documents
-
-- `/mnt/project/RFCP-Phase-3.0-Architecture-Refactor.md` — Full architecture spec
-- `/mnt/project/SESSION-2025-01-30-Iteration-10_1-Complete.md` — Previous session
-- `/mnt/transcripts/2026-02-01-19-06-32-phase-3.0-refactor-implementation-results.txt` — Detailed transcript
-
----
-
-## 🎮 Side Project
-
-During this session, also designed **DF Diplomacy Expanded** mod:
-- Design doc: `DF-Diplomacy-Expanded-Design-Doc.md` (1202 lines)
-- MVP: War score, peace negotiation, tribute, reputation
-- Motto: *"Losing is fun, but sometimes you want to lose diplomatically."*
-
----
-
-*"Standard preset works beautifully. Detailed preset needs love. The architecture is solid — now we optimize."*
diff --git a/backend/app/api/websocket.py b/backend/app/api/websocket.py
index ceb0f9e..34ec9fa 100644
--- a/backend/app/api/websocket.py
+++ b/backend/app/api/websocket.py
@@ -8,7 +8,6 @@ progress updates during computation phases.
 import time
 import asyncio
 import logging
-import threading
 from typing import Optional
 
 from fastapi import WebSocket, WebSocketDisconnect
@@ -51,7 +50,7 @@ class ConnectionManager:
                 "data": result,
             })
         except Exception as e:
-            logger.debug(f"[WS] send_result failed: {e}")
+            logger.warning(f"[WS] send_result failed: {e}")
 
     async def send_error(self, ws: WebSocket, calc_id: str, error: str):
         try:
@@ -61,7 +60,7 @@ class ConnectionManager:
                 "message": error,
             })
         except Exception as e:
-            logger.debug(f"[WS] send_error failed: {e}")
+            logger.warning(f"[WS] send_error failed: {e}")
 
 
 ws_manager = ConnectionManager()
@@ -74,14 +73,32 @@ async def _run_calculation(ws: WebSocket, calc_id: str, data: dict):
 
     # Shared progress state — written by worker threads, polled by event loop.
     # Python GIL makes dict value assignment atomic for simple types.
-    _progress = {"phase": "Initializing", "pct": 0.05, "seq": 0}
+    _progress = {"phase": "Initializing", "pct": 0.0, "seq": 0}
     _done = False
 
+    # Get event loop for cross-thread scheduling of WS sends.
+    loop = asyncio.get_running_loop()
+    _last_direct_pct = 0.0
+    _last_direct_phase = ""
+
     def sync_progress_fn(phase: str, pct: float, _eta: Optional[float] = None):
-        """Thread-safe progress callback — just updates a shared dict."""
+        """Thread-safe progress callback — updates dict AND schedules direct WS send."""
+        nonlocal _last_direct_pct, _last_direct_phase
         _progress["phase"] = phase
         _progress["pct"] = pct
         _progress["seq"] += 1
+        # Schedule direct WS send via event loop (works from any thread).
+        # Throttle: only send on phase change or >=2% progress.
+        if phase != _last_direct_phase or pct - _last_direct_pct >= 0.02:
+            _last_direct_pct = pct
+            _last_direct_phase = phase
+            try:
+                loop.call_soon_threadsafe(
+                    asyncio.ensure_future,
+                    ws_manager.send_progress(ws, calc_id, phase, pct),
+                )
+            except RuntimeError:
+                pass  # Event loop closed
 
     try:
         sites_data = data.get("sites", [])
@@ -116,21 +133,27 @@ async def _run_calculation(ws: WebSocket, calc_id: str, data: dict):
         if primary_model.name not in models_used:
             models_used.insert(0, primary_model.name)
 
-        await ws_manager.send_progress(ws, calc_id, "Initializing", 0.05)
+        await ws_manager.send_progress(ws, calc_id, "Initializing", 0.02)
 
-        # ── Progress poller: reads shared dict and sends WS updates ──
+        # ── Backup progress poller: catches anything call_soon_threadsafe missed ──
         async def progress_poller():
             last_sent_seq = 0
             last_sent_pct = 0.0
+            last_sent_phase = "Initializing"
             while not _done:
-                await asyncio.sleep(0.3)
+                await asyncio.sleep(0.5)
                 seq = _progress["seq"]
                 pct = _progress["pct"]
                 phase = _progress["phase"]
-                if seq != last_sent_seq and (pct - last_sent_pct >= 0.01 or phase != "Calculating coverage"):
+                # Send on any phase change OR >=3% progress (primary sends handle fine-grained)
+                if seq != last_sent_seq and (
+                    phase != last_sent_phase
+                    or pct - last_sent_pct >= 0.03
+                ):
                     await ws_manager.send_progress(ws, calc_id, phase, pct)
                     last_sent_seq = seq
                     last_sent_pct = pct
+                    last_sent_phase = phase
 
         poller_task = asyncio.create_task(progress_poller())
 
@@ -149,6 +172,7 @@ async def _run_calculation(ws: WebSocket, calc_id: str, data: dict):
                 points = await asyncio.wait_for(
                     coverage_service.calculate_multi_site_coverage(
                         sites, settings, cancel_token,
+                        progress_fn=sync_progress_fn,
                     ),
                     timeout=300.0,
                 )
@@ -170,7 +194,6 @@ async def _run_calculation(ws: WebSocket, calc_id: str, data: dict):
         # Stop poller and send final progress
         _done = True
         await poller_task
-        await ws_manager.send_progress(ws, calc_id, "Finalizing", 0.98)
 
         computation_time = time.time() - start_time
 
@@ -201,7 +224,10 @@ async def _run_calculation(ws: WebSocket, calc_id: str, data: dict):
             "models_used": models_used,
         }
 
+        # Send "Complete" before result so frontend shows 100%
+        await ws_manager.send_progress(ws, calc_id, "Complete", 1.0)
         await ws_manager.send_result(ws, calc_id, result)
+        logger.info(f"[WS] calc={calc_id} done: {len(points)} pts, {computation_time:.1f}s")
 
     except Exception as e:
         logger.error(f"[WS] Calculation error: {e}", exc_info=True)
diff --git a/backend/app/services/coverage_service.py b/backend/app/services/coverage_service.py
index b93ea75..078ac7c 100644
--- a/backend/app/services/coverage_service.py
+++ b/backend/app/services/coverage_service.py
@@ -485,7 +485,16 @@ class CoverageService:
         )
         streets = _filter_osm_list_to_bbox(streets, min_lat, min_lon, max_lat, max_lon)
         water_bodies = _filter_osm_list_to_bbox(water_bodies, min_lat, min_lon, max_lat, max_lon)
-        vegetation_areas = _filter_osm_list_to_bbox(vegetation_areas, min_lat, min_lon, max_lat, max_lon)
+        # Cap vegetation at 5000 — each area requires O(samples × areas)
+        # point-in-polygon checks per grid point.  20k+ areas with dominant
+        # path enabled causes OOM via worker memory explosion.
+        vegetation_areas = _filter_osm_list_to_bbox(
+            vegetation_areas, min_lat, min_lon, max_lat, max_lon,
+            max_count=5000,
+        )
+
+        _clog(f"Filtered OSM data: {len(buildings)} bldgs, {len(streets)} streets, "
+              f"{len(water_bodies)} water, {len(vegetation_areas)} veg")
 
         # Build spatial index for buildings
         spatial_idx: Optional[SpatialIndex] = None
@@ -650,10 +659,13 @@ class CoverageService:
         sites: List[SiteParams],
         settings: CoverageSettings,
         cancel_token: Optional[CancellationToken] = None,
+        progress_fn: Optional[Callable[[str, float], None]] = None,
     ) -> List[CoveragePoint]:
         """
         Calculate combined coverage from multiple sites
         Best server (strongest signal) wins at each point
+
+        progress_fn(phase, pct): optional callback for progress updates (0.0-1.0).
         """
         if not sites:
             return []
@@ -661,10 +673,26 @@ class CoverageService:
         # Apply preset once
         settings = apply_preset(settings)
 
+        # Per-site progress tracking for averaged overall progress
+        num_sites = len(sites)
+        _site_progress = [0.0] * num_sites
+
+        def _make_site_progress(idx: int):
+            """Create a progress_fn for one site that reports scaled overall progress."""
+            def _site_fn(phase: str, pct: float, _eta=None):
+                _site_progress[idx] = pct
+                if progress_fn:
+                    overall = sum(_site_progress) / num_sites
+                    progress_fn(f"Site {idx + 1}/{num_sites}: {phase}", overall)
+            return _site_fn
+
         # Get all individual coverages
         all_coverages = await asyncio.gather(*[
-            self.calculate_coverage(site, settings, cancel_token)
-            for site in sites
+            self.calculate_coverage(
+                site, settings, cancel_token,
+                progress_fn=_make_site_progress(i) if progress_fn else None,
+            )
+            for i, site in enumerate(sites)
         ])
 
         # Combine by best signal
@@ -751,7 +779,8 @@ class CoverageService:
         points = []
         timing = {"los": 0.0, "buildings": 0.0, "antenna": 0.0,
                   "dominant_path": 0.0, "street_canyon": 0.0,
-                  "reflection": 0.0, "vegetation": 0.0}
+                  "reflection": 0.0, "vegetation": 0.0,
+                  "lod_none": 0, "lod_simplified": 0, "lod_full": 0}
         total = len(grid)
         log_interval = max(1, total // 20)
 
@@ -901,7 +930,6 @@ class CoverageService:
 
             # LOD_NONE: skip dominant path entirely for distant points (>3km)
             if lod == LODLevel.NONE:
-                timing.setdefault("lod_none", 0)
                 timing["lod_none"] += 1
             else:
                 t0 = time.time()
@@ -909,12 +937,10 @@ class CoverageService:
                     # LOD_SIMPLIFIED: limit buildings for mid-range points (1.5-3km)
                     dp_buildings = nearby_buildings
                     if lod == LODLevel.SIMPLIFIED:
-                        timing.setdefault("lod_simplified", 0)
                         timing["lod_simplified"] += 1
                         if len(nearby_buildings) > SIMPLIFIED_MAX_BUILDINGS:
                             dp_buildings = nearby_buildings[:SIMPLIFIED_MAX_BUILDINGS]
                     else:
-                        timing.setdefault("lod_full", 0)
                         timing["lod_full"] += 1
 
                     # nearby_buildings already filtered via spatial index —
diff --git a/backend/app/services/parallel_coverage_service.py b/backend/app/services/parallel_coverage_service.py
index 97b8796..9d29cab 100644
--- a/backend/app/services/parallel_coverage_service.py
+++ b/backend/app/services/parallel_coverage_service.py
@@ -164,11 +164,16 @@ except ImportError:
     ray = None  # type: ignore
 
 
-# ── Worker-level spatial index cache (persists across tasks in same worker) ──
+# ── Worker-level caches (persist across tasks in same worker process) ──
 
 _worker_spatial_idx = None
 _worker_cache_key: Optional[str] = None
 
+# Shared-memory buildings/OSM — unpickled once per worker, cached by key
+_worker_shared_buildings = None
+_worker_shared_osm_data = None
+_worker_shared_data_key: Optional[str] = None
+
 
 def _ray_process_chunk_impl(chunk, terrain_cache, buildings, osm_data, config):
     """Implementation: process a chunk of (lat, lon, elevation) tuples.
@@ -205,6 +210,7 @@ def _ray_process_chunk_impl(chunk, terrain_cache, buildings, osm_data, config):
         "los": 0.0, "buildings": 0.0, "antenna": 0.0,
         "dominant_path": 0.0, "street_canyon": 0.0,
         "reflection": 0.0, "vegetation": 0.0,
+        "lod_none": 0, "lod_simplified": 0, "lod_full": 0,
     }
 
     precomputed = config.get('precomputed')
@@ -238,9 +244,14 @@ if RAY_AVAILABLE:
 
 
 def get_cpu_count() -> int:
-    """Get number of usable CPU cores, capped at 14."""
+    """Get number of usable CPU cores, capped at 6.
+
+    Each worker holds its own copy of buildings + OSM data + spatial index
+    (~200-400 MB per worker). Capping at 6 prevents OOM on systems with
+    8-16 GB RAM (especially WSL2 with limited memory allocation).
+    """
     try:
-        return min(mp.cpu_count() or 4, 14)
+        return min(mp.cpu_count() or 4, 6)
     except Exception:
         return 4
 
@@ -327,8 +338,25 @@ def calculate_coverage_parallel(
         except Exception as e:
             log_fn(f"Ray execution failed: {e} — falling back to sequential")
 
-    # Fallback: ProcessPoolExecutor with reduced workers to avoid MemoryError
-    pool_workers = min(num_workers, 6)
+    # Fallback: ProcessPoolExecutor (shared memory eliminates per-chunk pickle)
+    pool_workers = num_workers
+
+    # Scale workers down based on data volume to prevent OOM.
+    # Each worker unpickles + holds its own copy of buildings, OSM data, and
+    # spatial index.  With large datasets the per-worker memory can exceed
+    # 300 MB, so reduce workers to keep total under ~2 GB.
+    data_items = len(buildings) + len(streets) + len(water_bodies) + len(vegetation_areas)
+    if data_items > 20000:
+        pool_workers = min(pool_workers, 2)
+        log_fn(f"Data volume high ({data_items} items) — capping workers at {pool_workers}")
+    elif data_items > 10000:
+        pool_workers = min(pool_workers, 3)
+        log_fn(f"Data volume moderate ({data_items} items) — capping workers at {pool_workers}")
+    elif data_items > 5000:
+        pool_workers = min(pool_workers, 4)
+        log_fn(f"Data volume elevated ({data_items} items) — capping workers at {pool_workers}")
+
+    log_fn(f"ProcessPool: {pool_workers} workers (cpu_count={num_workers}, data_items={data_items})")
     if pool_workers > 1 and total_points > 100:
         try:
             return _calculate_with_process_pool(
@@ -338,6 +366,8 @@ def calculate_coverage_parallel(
                 pool_workers, log_fn, cancel_token, precomputed,
                 progress_fn,
             )
+        except (MemoryError, OSError) as e:
+            log_fn(f"ProcessPool OOM/OS error: {e} — falling back to sequential")
         except Exception as e:
             log_fn(f"ProcessPool failed: {e} — falling back to sequential")
 
@@ -396,8 +426,8 @@ def _calculate_with_ray(
         for lat, lon in grid
     ]
 
-    # ~4 chunks per worker for granular progress
-    chunk_size = max(1, len(items) // (num_workers * 4))
+    # Larger chunks to amortize IPC overhead (was num_workers*4)
+    chunk_size = max(1, min(400, len(items) // max(2, num_workers)))
     chunks = [items[i:i + chunk_size] for i in range(0, len(items), chunk_size)]
     log_fn(f"Submitting {len(chunks)} chunks of ~{chunk_size} points")
 
@@ -489,6 +519,7 @@ def _pool_worker_process_chunk(args):
         "los": 0.0, "buildings": 0.0, "antenna": 0.0,
         "dominant_path": 0.0, "street_canyon": 0.0,
         "reflection": 0.0, "vegetation": 0.0,
+        "lod_none": 0, "lod_simplified": 0, "lod_full": 0,
     }
 
     precomputed = config.get('precomputed')
@@ -542,6 +573,28 @@ def _store_terrain_in_shm(terrain_cache: Dict[str, np.ndarray], log_fn) -> Tuple
     return blocks, refs
 
 
+def _store_pickle_in_shm(data, label: str, log_fn) -> Tuple[Optional[Any], Optional[dict]]:
+    """Pickle arbitrary data into a SharedMemory block.
+
+    Returns (shm_block, ref_dict) where ref_dict = {shm_name, size}.
+    On failure returns (None, None) and caller should fall back to pickle.
+    """
+    import multiprocessing.shared_memory as shm_mod
+    import pickle
+
+    try:
+        blob = pickle.dumps(data, protocol=pickle.HIGHEST_PROTOCOL)
+        size = len(blob)
+        block = shm_mod.SharedMemory(create=True, size=size)
+        block.buf[:size] = blob
+        mb = size / (1024 * 1024)
+        log_fn(f"{label} in shared memory: {mb:.1f} MB")
+        return block, {'shm_name': block.name, 'size': size}
+    except Exception as e:
+        log_fn(f"Failed to store {label} in shm: {e}")
+        return None, None
+
+
 def _pool_worker_shm_chunk(args):
     """Worker function that reads terrain from shared memory instead of pickle."""
     import multiprocessing.shared_memory as shm_mod
@@ -585,6 +638,7 @@ def _pool_worker_shm_chunk(args):
         "los": 0.0, "buildings": 0.0, "antenna": 0.0,
         "dominant_path": 0.0, "street_canyon": 0.0,
         "reflection": 0.0, "vegetation": 0.0,
+        "lod_none": 0, "lod_simplified": 0, "lod_full": 0,
     }
 
     precomputed = config.get('precomputed')
@@ -607,6 +661,200 @@ def _pool_worker_shm_chunk(args):
     return results
 
 
+_worker_chunk_count: int = 0  # per-worker chunk counter
+
+
+def _pool_worker_shm_shared(args):
+    """Worker: terrain + buildings + OSM all via shared memory.
+
+    Per-chunk args are tiny (~8 KB): just point coords, shm refs, and config.
+    Buildings and OSM data are unpickled from shared memory ONCE per worker
+    and cached in module globals for subsequent chunks.
+    """
+    import multiprocessing.shared_memory as shm_mod
+    import pickle
+
+    global _worker_chunk_count
+    _worker_chunk_count += 1
+    pid = os.getpid()
+    t_worker_start = time.perf_counter()
+
+    chunk, terrain_shm_refs, shared_data_refs, config = args
+
+    # ── Reconstruct terrain from shared memory ──
+    t0 = time.perf_counter()
+    terrain_cache = {}
+    for tile_name, ref in terrain_shm_refs.items():
+        try:
+            block = shm_mod.SharedMemory(name=ref['shm_name'])
+            terrain_cache[tile_name] = np.ndarray(
+                ref['shape'], dtype=ref['dtype'], buffer=block.buf,
+            )
+        except Exception:
+            pass
+
+    from app.services.terrain_service import terrain_service
+    terrain_service._tile_cache = terrain_cache
+    t_terrain_shm = time.perf_counter() - t0
+
+    # ── Read buildings + OSM from shared memory (cached per worker) ──
+    global _worker_shared_buildings, _worker_shared_osm_data, _worker_shared_data_key
+    global _worker_spatial_idx, _worker_cache_key
+
+    data_key = config.get('cache_key', '')
+    cached = (_worker_shared_data_key == data_key)
+
+    t_unpickle_bld = 0.0
+    t_unpickle_osm = 0.0
+    t_spatial = 0.0
+
+    if not cached:
+        # First chunk for this calculation — unpickle from shm
+        buildings_ref = shared_data_refs.get('buildings')
+        osm_ref = shared_data_refs.get('osm_data')
+
+        if buildings_ref:
+            try:
+                t0 = time.perf_counter()
+                blk = shm_mod.SharedMemory(name=buildings_ref['shm_name'])
+                _worker_shared_buildings = pickle.loads(bytes(blk.buf[:buildings_ref['size']]))
+                t_unpickle_bld = time.perf_counter() - t0
+            except Exception:
+                _worker_shared_buildings = []
+        else:
+            _worker_shared_buildings = []
+
+        if osm_ref:
+            try:
+                t0 = time.perf_counter()
+                blk = shm_mod.SharedMemory(name=osm_ref['shm_name'])
+                _worker_shared_osm_data = pickle.loads(bytes(blk.buf[:osm_ref['size']]))
+                t_unpickle_osm = time.perf_counter() - t0
+            except Exception:
+                _worker_shared_osm_data = {}
+        else:
+            _worker_shared_osm_data = {}
+
+        _worker_shared_data_key = data_key
+
+        # Rebuild spatial index for new data
+        t0 = time.perf_counter()
+        if _worker_shared_buildings:
+            from app.services.spatial_index import SpatialIndex
+            _worker_spatial_idx = SpatialIndex()
+            _worker_spatial_idx.build(_worker_shared_buildings)
+        else:
+            _worker_spatial_idx = None
+        _worker_cache_key = data_key
+        t_spatial = time.perf_counter() - t0
+
+        print(
+            f"[WORKER {pid}] Init: terrain_shm={t_terrain_shm*1000:.1f}ms "
+            f"unpickle_bld={t_unpickle_bld*1000:.1f}ms "
+            f"unpickle_osm={t_unpickle_osm*1000:.1f}ms "
+            f"spatial={t_spatial*1000:.1f}ms "
+            f"buildings={len(_worker_shared_buildings or [])} "
+            f"tiles={len(terrain_cache)}",
+            flush=True,
+        )
+
+    print(
+        f"[WORKER {pid}] Processing chunk {_worker_chunk_count}, "
+        f"cached={cached}, points={len(chunk)}",
+        flush=True,
+    )
+
+    buildings = _worker_shared_buildings or []
+    osm_data = _worker_shared_osm_data or {}
+
+    # ── Imports + object creation (timed) ──
+    t0 = time.perf_counter()
+    from app.services.coverage_service import CoverageService, SiteParams, CoverageSettings
+    t_import = time.perf_counter() - t0
+
+    t0 = time.perf_counter()
+    site = SiteParams(**config['site_dict'])
+    settings = CoverageSettings(**config['settings_dict'])
+    svc = CoverageService()
+    t_pydantic = time.perf_counter() - t0
+
+    timing = {
+        "los": 0.0, "buildings": 0.0, "antenna": 0.0,
+        "dominant_path": 0.0, "street_canyon": 0.0,
+        "reflection": 0.0, "vegetation": 0.0,
+        "lod_none": 0, "lod_simplified": 0, "lod_full": 0,
+    }
+
+    precomputed = config.get('precomputed')
+
+    streets = osm_data.get('streets', [])
+    water = osm_data.get('water_bodies', [])
+    veg = osm_data.get('vegetation_areas', [])
+    site_elev = config['site_elevation']
+
+    t_init_done = time.perf_counter()
+    init_ms = (t_init_done - t_worker_start) * 1000
+
+    # ── Process points with per-point profiling (first 3 only) ──
+    results = []
+    t_loop_start = time.perf_counter()
+    t_model_dump_total = 0.0
+    n_dumped = 0
+
+    for i, (lat, lon, point_elev) in enumerate(chunk):
+        pre = precomputed.get((lat, lon)) if precomputed else None
+
+        # Snapshot timing dict before call (for first 3 points)
+        if i < 3:
+            timing_before = {k: v for k, v in timing.items()}
+            t_pt = time.perf_counter()
+
+        point = svc._calculate_point_sync(
+            site, lat, lon, settings,
+            buildings, streets,
+            _worker_spatial_idx, water, veg,
+            site_elev, point_elev, timing,
+            precomputed_distance=pre.get('distance') if pre else None,
+            precomputed_path_loss=pre.get('path_loss') if pre else None,
+        )
+
+        if i < 3:
+            t_pt_done = time.perf_counter()
+            pt_ms = (t_pt_done - t_pt) * 1000
+            deltas = {k: (timing[k] - timing_before.get(k, 0)) * 1000 for k in timing}
+            parts = " ".join(f"{k}={v:.2f}" for k, v in deltas.items() if v > 0.001)
+            print(
+                f"[WORKER {pid}] Point {i}: {pt_ms:.2f}ms "
+                f"rsrp={point.rsrp:.1f} dist={point.distance:.0f}m "
+                f"breakdown=[{parts}]",
+                flush=True,
+            )
+
+        if point.rsrp >= settings.min_signal:
+            t_md = time.perf_counter()
+            results.append(point.model_dump())
+            t_model_dump_total += time.perf_counter() - t_md
+            n_dumped += 1
+
+    t_loop_done = time.perf_counter()
+    loop_ms = (t_loop_done - t_loop_start) * 1000
+    total_ms = (t_loop_done - t_worker_start) * 1000
+    avg_pt = loop_ms / len(chunk) if chunk else 0
+    avg_dump = (t_model_dump_total * 1000 / n_dumped) if n_dumped else 0
+
+    print(
+        f"[WORKER {pid}] Chunk done: total={total_ms:.0f}ms "
+        f"init={init_ms:.0f}ms loop={loop_ms:.0f}ms "
+        f"avg_pt={avg_pt:.2f}ms model_dump={avg_dump:.2f}ms×{n_dumped} "
+        f"import={t_import*1000:.1f}ms pydantic={t_pydantic*1000:.1f}ms "
+        f"terrain_shm={t_terrain_shm*1000:.1f}ms "
+        f"results={len(results)}/{len(chunk)}",
+        flush=True,
+    )
+
+    return results
+
+
 def _calculate_with_process_pool(
     grid, point_elevations, site_dict, settings_dict,
     terrain_cache, buildings, streets, water_bodies,
@@ -616,23 +864,28 @@ def _calculate_with_process_pool(
 ):
     """Execute using ProcessPoolExecutor.
 
-    Uses shared memory for terrain tiles (zero-copy numpy views) to reduce
-    memory usage compared to pickling full terrain arrays per worker.
+    Uses shared memory for terrain tiles (zero-copy numpy views), buildings,
+    and OSM data (pickle-once, read-many) to eliminate per-chunk serialization
+    overhead.
     """
     from concurrent.futures import ProcessPoolExecutor, as_completed
 
     total_points = len(grid)
-
-    # Estimate pickle size for building data and cap workers accordingly
     building_count = len(buildings)
-    if building_count > 10000:
-        num_workers = min(num_workers, 3)
-        log_fn(f"Large building set ({building_count}) — reducing workers to {num_workers}")
-    elif building_count > 5000:
-        num_workers = min(num_workers, 4)
+    data_items = building_count + len(streets) + len(water_bodies) + len(vegetation_areas)
 
     log_fn(f"ProcessPool mode: {total_points} points, {num_workers} workers, "
-           f"{building_count} buildings")
+           f"{building_count} buildings, {data_items} total OSM items")
+
+    # Log memory at start
+    try:
+        with open('/proc/self/status') as f:
+            for line in f:
+                if line.startswith('VmRSS:'):
+                    log_fn(f"Memory before calculation: {line.strip()}")
+                    break
+    except Exception:
+        pass
 
     # Store terrain tiles in shared memory
     shm_blocks = []
@@ -652,12 +905,31 @@ def _calculate_with_process_pool(
         log_fn(f"Shared memory setup failed ({e}), using pickle fallback")
         use_shm = False
 
+    # Store buildings + OSM data in shared memory (pickle once, read many)
+    shared_data_refs = {}
+    if use_shm:
+        bld_block, bld_ref = _store_pickle_in_shm(buildings, "Buildings", log_fn)
+        if bld_block:
+            shm_blocks.append(bld_block)
+            shared_data_refs['buildings'] = bld_ref
+
+        osm_data_dict = {
+            'streets': streets,
+            'water_bodies': water_bodies,
+            'vegetation_areas': vegetation_areas,
+        }
+        osm_block, osm_ref = _store_pickle_in_shm(osm_data_dict, "OSM data", log_fn)
+        if osm_block:
+            shm_blocks.append(osm_block)
+            shared_data_refs['osm_data'] = osm_ref
+
     items = [
         (lat, lon, point_elevations.get((lat, lon), 0.0))
         for lat, lon in grid
     ]
 
-    chunk_size = max(1, len(items) // (num_workers * 2))
+    # Target larger chunks to amortize IPC overhead (was num_workers*2)
+    chunk_size = max(1, min(400, len(items) // max(2, num_workers)))
     chunks = [items[i:i + chunk_size] for i in range(0, len(items), chunk_size)]
     log_fn(f"Submitting {len(chunks)} chunks of ~{chunk_size} points")
 
@@ -685,8 +957,21 @@ def _calculate_with_process_pool(
         pool = ProcessPoolExecutor(max_workers=num_workers, mp_context=ctx)
         _set_active_pool(pool)
 
-        if use_shm:
-            # Shared memory path: pass shm refs instead of terrain data
+        if use_shm and shared_data_refs:
+            # Full shared memory path: terrain + buildings + OSM all via shm
+            worker_fn = _pool_worker_shm_shared
+            futures = {
+                pool.submit(
+                    worker_fn,
+                    (chunk, terrain_shm_refs, shared_data_refs, config),
+                ): i
+                for i, chunk in enumerate(chunks)
+            }
+        elif use_shm and data_items <= 2000:
+            # Terrain-only shm — buildings/OSM pickled per chunk.
+            # Only safe for small datasets; large datasets would OOM from
+            # pickle copies (num_chunks × pickle_size).
+            log_fn(f"Terrain-only shm (small data: {data_items} items)")
             worker_fn = _pool_worker_shm_chunk
             futures = {
                 pool.submit(
@@ -695,8 +980,9 @@ def _calculate_with_process_pool(
                 ): i
                 for i, chunk in enumerate(chunks)
             }
-        else:
-            # Pickle fallback path
+        elif data_items <= 2000:
+            # Full pickle fallback — only safe for small datasets
+            log_fn(f"Full pickle path (small data: {data_items} items)")
             futures = {
                 pool.submit(
                     _pool_worker_process_chunk,
@@ -704,6 +990,14 @@ def _calculate_with_process_pool(
                 ): i
                 for i, chunk in enumerate(chunks)
             }
+        else:
+            # Large dataset + shared memory failed → per-chunk pickle would OOM.
+            # Bail out; caller will fall back to sequential.
+            log_fn(f"Shared memory failed for large dataset ({data_items} items) "
+                   f"— skipping ProcessPool to avoid OOM")
+            raise MemoryError(
+                f"Cannot safely pickle {data_items} OSM items per chunk"
+            )
 
         completed_chunks = 0
         for future in as_completed(futures):
@@ -730,6 +1024,9 @@ def _calculate_with_process_pool(
             if progress_fn:
                 progress_fn("Calculating coverage", 0.40 + 0.55 * (completed_chunks / len(chunks)))
 
+    except MemoryError:
+        raise  # Propagate to caller for sequential fallback
+
     except Exception as e:
         log_fn(f"ProcessPool error: {e}")
 
@@ -748,8 +1045,22 @@ def _calculate_with_process_pool(
                 block.unlink()
             except Exception:
                 pass
+        # Release large local references before GC
+        chunks = None  # noqa: F841
+        items = None  # noqa: F841
+        osm_data = None  # noqa: F841
+        shared_data_refs = None  # noqa: F841
         # Force garbage collection to release memory from workers
         gc.collect()
+        # Log memory after cleanup
+        try:
+            with open('/proc/self/status') as f:
+                for line in f:
+                    if line.startswith('VmRSS:'):
+                        log_fn(f"Memory after cleanup: {line.strip()}")
+                        break
+        except Exception:
+            pass
 
     calc_time = time.time() - t_calc
     log_fn(f"ProcessPool done: {calc_time:.1f}s, {len(all_results)} results "
@@ -758,7 +1069,11 @@ def _calculate_with_process_pool(
     timing = {
         "parallel_total": calc_time,
         "workers": num_workers,
-        "backend": "process_pool" + ("/shm" if use_shm else "/pickle"),
+        "backend": "process_pool" + (
+            "/shm_full" if (use_shm and shared_data_refs)
+            else "/shm_terrain" if use_shm
+            else "/pickle"
+        ),
     }
     return all_results, timing
 
@@ -791,6 +1106,7 @@ def _calculate_sequential(
         "los": 0.0, "buildings": 0.0, "antenna": 0.0,
         "dominant_path": 0.0, "street_canyon": 0.0,
         "reflection": 0.0, "vegetation": 0.0,
+        "lod_none": 0, "lod_simplified": 0, "lod_full": 0,
     }
 
     t0 = time.time()
diff --git a/RFCP-Iteration-3.1.0-LOD-Optimization.md b/docs/devlog/installer/RFCP-Iteration-3.1.0-LOD-Optimization.md
similarity index 100%
rename from RFCP-Iteration-3.1.0-LOD-Optimization.md
rename to docs/devlog/installer/RFCP-Iteration-3.1.0-LOD-Optimization.md
diff --git a/RFCP-Iteration-3.2.0-Comprehensive-Fixes.md b/docs/devlog/installer/RFCP-Iteration-3.2.0-Comprehensive-Fixes.md
similarity index 100%
rename from RFCP-Iteration-3.2.0-Comprehensive-Fixes.md
rename to docs/devlog/installer/RFCP-Iteration-3.2.0-Comprehensive-Fixes.md
diff --git a/RFCP-Iteration-3.2.2-Diagnostic.md b/docs/devlog/installer/RFCP-Iteration-3.2.2-Diagnostic.md
similarity index 100%
rename from RFCP-Iteration-3.2.2-Diagnostic.md
rename to docs/devlog/installer/RFCP-Iteration-3.2.2-Diagnostic.md
diff --git a/RFCP-Iteration-3.3.0-Architecture-Refactor.md b/docs/devlog/installer/RFCP-Iteration-3.3.0-Architecture-Refactor.md
similarity index 100%
rename from RFCP-Iteration-3.3.0-Architecture-Refactor.md
rename to docs/devlog/installer/RFCP-Iteration-3.3.0-Architecture-Refactor.md
diff --git a/RFCP-Phase-2.4-GPU-Elevation.md b/docs/devlog/installer/RFCP-Phase-2.4-GPU-Elevation.md
similarity index 100%
rename from RFCP-Phase-2.4-GPU-Elevation.md
rename to docs/devlog/installer/RFCP-Phase-2.4-GPU-Elevation.md
diff --git a/RFCP-Phase-2.4.1-Critical-Fixes.md b/docs/devlog/installer/RFCP-Phase-2.4.1-Critical-Fixes.md
similarity index 100%
rename from RFCP-Phase-2.4.1-Critical-Fixes.md
rename to docs/devlog/installer/RFCP-Phase-2.4.1-Critical-Fixes.md
diff --git a/RFCP-Phase-2.4.2-Final-Fixes.md b/docs/devlog/installer/RFCP-Phase-2.4.2-Final-Fixes.md
similarity index 100%
rename from RFCP-Phase-2.4.2-Final-Fixes.md
rename to docs/devlog/installer/RFCP-Phase-2.4.2-Final-Fixes.md
diff --git a/RFCP-Phase-2.5.0-NumPy-Vectorization.md b/docs/devlog/installer/RFCP-Phase-2.5.0-NumPy-Vectorization.md
similarity index 100%
rename from RFCP-Phase-2.5.0-NumPy-Vectorization.md
rename to docs/devlog/installer/RFCP-Phase-2.5.0-NumPy-Vectorization.md
diff --git a/RFCP-Phase-2.5.1-Performance-AppClose.md b/docs/devlog/installer/RFCP-Phase-2.5.1-Performance-AppClose.md
similarity index 100%
rename from RFCP-Phase-2.5.1-Performance-AppClose.md
rename to docs/devlog/installer/RFCP-Phase-2.5.1-Performance-AppClose.md
diff --git a/RFCP-Phase-3.0-Architecture-Refactor.md b/docs/devlog/installer/RFCP-Phase-3.0-Architecture-Refactor.md
similarity index 100%
rename from RFCP-Phase-3.0-Architecture-Refactor.md
rename to docs/devlog/installer/RFCP-Phase-3.0-Architecture-Refactor.md
diff --git a/compass_artifact_wf-6a6a41ed-a3b3-461d-9341-81ce0ff4260d_text_markdown.md b/docs/devlog/installer/compass_artifact_wf-6a6a41ed-a3b3-461d-9341-81ce0ff4260d_text_markdown.md
similarity index 100%
rename from compass_artifact_wf-6a6a41ed-a3b3-461d-9341-81ce0ff4260d_text_markdown.md
rename to docs/devlog/installer/compass_artifact_wf-6a6a41ed-a3b3-461d-9341-81ce0ff4260d_text_markdown.md
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 4363a62..b474aa5 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -19,6 +19,8 @@ import SiteList from '@/components/panels/SiteList.tsx';
 import ExportPanel from '@/components/panels/ExportPanel.tsx';
 import ProjectPanel from '@/components/panels/ProjectPanel.tsx';
 import CoverageStats from '@/components/panels/CoverageStats.tsx';
+import HistoryPanel from '@/components/panels/HistoryPanel.tsx';
+import ResultsPanel from '@/components/panels/ResultsPanel.tsx';
 import SiteImportExport from '@/components/panels/SiteImportExport.tsx';
 import { SiteConfigModal } from '@/components/modals/index.ts';
 import type { SiteFormValues } from '@/components/modals/index.ts';
@@ -394,8 +396,8 @@ export default function App() {
     const currentSettings = useCoverageStore.getState().settings;
 
     // Validation
-    if (currentSettings.radius > 100) {
-      addToast('Radius too large (max 100km)', 'error');
+    if (currentSettings.radius > 50) {
+      addToast('Radius too large (max 50km)', 'error');
       return;
     }
     if (currentSettings.resolution < 50) {
@@ -406,9 +408,17 @@ export default function App() {
     try {
       await calculateCoverageApi();
 
-      // Check result after calculation
-      const result = useCoverageStore.getState().result;
-      const error = useCoverageStore.getState().error;
+      // After calculateCoverageApi returns, check if WS took over.
+      // In WS mode, the function returns immediately and result arrives asynchronously.
+      const state = useCoverageStore.getState();
+      if (state.isCalculating && state.activeCalcId) {
+        // WebSocket mode — toast will be shown from the WS onResult callback
+        return;
+      }
+
+      // HTTP mode — result is ready now
+      const result = state.result;
+      const error = state.error;
 
       if (error) {
         let userMessage = 'Calculation failed';
@@ -666,6 +676,7 @@ export default function App() {
             )}
           </MapView>
           <HeatmapLegend />
+          <ResultsPanel />
         </div>
 
         {/* Side panel */}
@@ -706,14 +717,15 @@ export default function App() {
                 <NumberInput
                   label="Radius"
                   value={settings.radius}
-                  onChange={(v) =>
-                    useCoverageStore.getState().updateSettings({ radius: v })
-                  }
+                  onChange={(v) => {
+                    const clamped = Math.min(v, 50);
+                    useCoverageStore.getState().updateSettings({ radius: clamped });
+                  }}
                   min={1}
-                  max={100}
+                  max={50}
                   step={5}
                   unit="km"
-                  hint="Calculation area around each site"
+                  hint="Calculation area around each site (max 50km)"
                 />
                 <NumberInput
                   label="Resolution"
@@ -1174,6 +1186,9 @@ export default function App() {
               modelsUsed={coverageResult?.modelsUsed}
             />
 
+            {/* Session history */}
+            <HistoryPanel />
+
             {/* Export coverage data */}
             <ExportPanel />
 
diff --git a/frontend/src/components/map/CoverageBoundary.tsx b/frontend/src/components/map/CoverageBoundary.tsx
index 14aa3a8..db7b8d4 100644
--- a/frontend/src/components/map/CoverageBoundary.tsx
+++ b/frontend/src/components/map/CoverageBoundary.tsx
@@ -27,7 +27,7 @@ export default function CoverageBoundary({
   points,
   visible,
   resolution,
-  color = '#7c3aed', // purple-600 — visible against both map and orange gradient
+  color = '#ffffff', // white — visible against red-to-blue gradient
   weight = 2,
 }: CoverageBoundaryProps) {
   const map = useMap();
diff --git a/frontend/src/components/map/HeatmapLegend.tsx b/frontend/src/components/map/HeatmapLegend.tsx
index 3c99acd..6c96f47 100644
--- a/frontend/src/components/map/HeatmapLegend.tsx
+++ b/frontend/src/components/map/HeatmapLegend.tsx
@@ -13,12 +13,11 @@ import { useSitesStore } from '@/store/sites.ts';
 
 const LEGEND_STEPS = [
   { rsrp: -130, label: 'No Service' },
-  { rsrp: -110, label: 'Very Weak' },
-  { rsrp: -100, label: 'Weak' },
-  { rsrp: -90, label: 'Fair' },
-  { rsrp: -80, label: 'Good' },
-  { rsrp: -70, label: 'Strong' },
-  { rsrp: -50, label: 'Excellent' },
+  { rsrp: -110, label: 'Weak' },
+  { rsrp: -100, label: 'Fair' },
+  { rsrp: -85, label: 'Good' },
+  { rsrp: -70, label: 'Excellent' },
+  { rsrp: -50, label: 'Max' },
 ];
 
 /** Build a CSS linear-gradient string matching the heatmap gradient exactly. */
@@ -106,9 +105,9 @@ export default function HeatmapLegend() {
 
       {/* Cutoff indicator + below-threshold (dimmed) */}
       {belowThreshold.length > 0 && (
-        <div className="mt-1.5 pt-1.5 border-t border-dashed border-purple-400 dark:border-purple-500">
+        <div className="mt-1.5 pt-1.5 border-t border-dashed border-gray-400 dark:border-gray-500">
           <div className="flex items-center gap-1 mb-1">
-            <span className="text-[9px] text-purple-500 dark:text-purple-400 font-medium">
+            <span className="text-[9px] text-gray-500 dark:text-gray-400 font-medium">
               ─ ─ Coverage boundary ({threshold} dBm)
             </span>
           </div>
diff --git a/frontend/src/components/modals/SiteConfigModal.tsx b/frontend/src/components/modals/SiteConfigModal.tsx
index 363d54a..a571a08 100644
--- a/frontend/src/components/modals/SiteConfigModal.tsx
+++ b/frontend/src/components/modals/SiteConfigModal.tsx
@@ -1,6 +1,5 @@
 import { useState, useEffect, useCallback } from 'react';
 import NumberInput from '@/components/ui/NumberInput.tsx';
-import FrequencySelector from '@/components/panels/FrequencySelector.tsx';
 import FrequencyBandPanel from '@/components/panels/FrequencyBandPanel.tsx';
 import ModalBackdrop from './ModalBackdrop.tsx';
 
@@ -31,6 +30,7 @@ interface SiteConfigModalProps {
 const TEMPLATES = {
   limesdr: {
     label: 'LimeSDR',
+    tooltip: 'SDR dev board — low power, short range testing (20 dBm, 2 dBi, 1800 MHz)',
     style: 'purple',
     name: 'LimeSDR Mini',
     power: 20,
@@ -41,6 +41,7 @@ const TEMPLATES = {
   },
   lowBBU: {
     label: 'Low BBU',
+    tooltip: 'Low-power baseband unit — suburban/campus coverage (40 dBm, 8 dBi, 1800 MHz)',
     style: 'green',
     name: 'Low Power BBU',
     power: 40,
@@ -51,6 +52,7 @@ const TEMPLATES = {
   },
   highBBU: {
     label: 'High BBU',
+    tooltip: 'High-power BBU — urban macro sector (43 dBm, 15 dBi, 65\u00B0 sector)',
     style: 'orange',
     name: 'High Power BBU',
     power: 43,
@@ -63,6 +65,7 @@ const TEMPLATES = {
   },
   urbanMacro: {
     label: 'Urban Macro',
+    tooltip: 'Standard urban macro site — rooftop/tower sector (43 dBm, 18 dBi, 65\u00B0 sector)',
     style: 'blue',
     name: 'Urban Macro Site',
     power: 43,
@@ -75,6 +78,7 @@ const TEMPLATES = {
   },
   ruralTower: {
     label: 'Rural Tower',
+    tooltip: 'Rural high tower — long range 800 MHz omni coverage (46 dBm, 8 dBi, 50m)',
     style: 'emerald',
     name: 'Rural Tower',
     power: 46,
@@ -85,6 +89,7 @@ const TEMPLATES = {
   },
   smallCell: {
     label: 'Small Cell',
+    tooltip: 'Urban small cell — street-level high capacity (30 dBm, 12 dBi, 2600 MHz)',
     style: 'cyan',
     name: 'Small Cell',
     power: 30,
@@ -97,6 +102,7 @@ const TEMPLATES = {
   },
   indoorDAS: {
     label: 'Indoor DAS',
+    tooltip: 'Indoor distributed antenna — in-building coverage (23 dBm, 2 dBi, 2100 MHz)',
     style: 'rose',
     name: 'Indoor DAS',
     power: 23,
@@ -107,6 +113,7 @@ const TEMPLATES = {
   },
   uhfTactical: {
     label: 'UHF Tactical',
+    tooltip: 'UHF tactical radio — man-portable field comms (25 dBm, 3 dBi, 450 MHz)',
     style: 'amber',
     name: 'UHF Tactical Radio',
     power: 25,
@@ -117,6 +124,7 @@ const TEMPLATES = {
   },
   vhfRepeater: {
     label: 'VHF Repeater',
+    tooltip: 'VHF repeater — long range voice/data relay (40 dBm, 6 dBi, 150 MHz)',
     style: 'teal',
     name: 'VHF Repeater',
     power: 40,
@@ -203,8 +211,8 @@ export default function SiteConfigModal({
     if (form.power < 10 || form.power > 50) {
       newErrors.power = 'Power must be 10-50 dBm';
     }
-    if (form.gain < 0 || form.gain > 25) {
-      newErrors.gain = 'Gain must be 0-25 dBi';
+    if (form.gain < 0 || form.gain > 30) {
+      newErrors.gain = 'Gain must be 0-30 dBi';
     }
     if (form.frequency < 100 || form.frequency > 6000) {
       newErrors.frequency = 'Frequency must be 100-6000 MHz';
@@ -360,20 +368,20 @@ export default function SiteConfigModal({
             label="Antenna Gain"
             value={form.gain}
             min={0}
-            max={25}
+            max={30}
             step={0.5}
             unit="dBi"
-            hint="Omni 2-8, Sector 15-18, Parabolic 20-25"
+            hint={
+              form.gain <= 8
+                ? `Omni-directional (${form.gain} dBi)`
+                : form.gain <= 18
+                  ? `Sector/Panel (${form.gain} dBi)`
+                  : `Parabolic/Dish (${form.gain} dBi)`
+            }
             onChange={(v) => updateField('gain', v)}
           />
 
-          {/* Frequency */}
-          <FrequencySelector
-            value={form.frequency}
-            onChange={(v) => updateField('frequency', v)}
-          />
-
-          {/* Band panel — UHF/VHF/LTE/5G grouped selector */}
+          {/* Band panel — UHF/VHF/LTE/5G grouped selector + custom input */}
           <FrequencyBandPanel
             value={form.frequency}
             onChange={(v) => updateField('frequency', v)}
@@ -485,6 +493,7 @@ export default function SiteConfigModal({
                   key={key}
                   type="button"
                   onClick={() => applyTemplate(key as keyof typeof TEMPLATES)}
+                  title={t.tooltip}
                   className={`px-3 py-1.5 rounded text-xs font-medium transition-colors min-h-[32px]
                     ${TEMPLATE_COLORS[t.style] ?? TEMPLATE_COLORS.blue}`}
                 >
diff --git a/frontend/src/components/panels/CoverageStats.tsx b/frontend/src/components/panels/CoverageStats.tsx
index d3c83c1..845463a 100644
--- a/frontend/src/components/panels/CoverageStats.tsx
+++ b/frontend/src/components/panels/CoverageStats.tsx
@@ -19,8 +19,8 @@ function estimateAreaKm2(pointCount: number, resolutionM: number): number {
 }
 
 const LEVELS = [
-  { label: 'Excellent', threshold: -70, color: 'bg-green-500' },
-  { label: 'Good', threshold: -85, color: 'bg-lime-500' },
+  { label: 'Excellent', threshold: -70, color: 'bg-blue-500' },
+  { label: 'Good', threshold: -85, color: 'bg-green-500' },
   { label: 'Fair', threshold: -100, color: 'bg-yellow-500' },
   { label: 'Weak', threshold: -Infinity, color: 'bg-red-500' },
 ] as const;
diff --git a/frontend/src/components/panels/FrequencyBandPanel.tsx b/frontend/src/components/panels/FrequencyBandPanel.tsx
index 2b23875..aa8af40 100644
--- a/frontend/src/components/panels/FrequencyBandPanel.tsx
+++ b/frontend/src/components/panels/FrequencyBandPanel.tsx
@@ -5,6 +5,7 @@
  * and propagation model info for each band.
  */
 
+import { useState } from 'react';
 import { COMMON_FREQUENCIES, FREQUENCY_GROUPS, getWavelength } from '@/constants/frequencies.ts';
 import type { FrequencyBand } from '@/types/index.ts';
 
@@ -54,11 +55,25 @@ function getBandForFrequency(freq: number): string | null {
 
 export default function FrequencyBandPanel({ value, onChange }: FrequencyBandPanelProps) {
   const currentBand = getBandForFrequency(value);
+  const [customInput, setCustomInput] = useState('');
+
+  const handleCustomSubmit = () => {
+    const parsed = parseInt(customInput, 10);
+    if (parsed > 0 && parsed <= 100000) {
+      onChange(parsed);
+      setCustomInput('');
+    }
+  };
 
   return (
     <div className="space-y-3">
-      <div className="text-xs font-semibold text-gray-500 dark:text-dark-muted uppercase tracking-wide">
-        Frequency Bands
+      <div className="flex items-center justify-between">
+        <div className="text-xs font-semibold text-gray-500 dark:text-dark-muted uppercase tracking-wide">
+          Operating Frequency
+        </div>
+        <div className="text-xs font-medium text-gray-600 dark:text-dark-muted">
+          {value} MHz
+        </div>
       </div>
 
       {(Object.keys(FREQUENCY_GROUPS) as Array<keyof typeof FREQUENCY_GROUPS>).map((bandType) => {
@@ -139,6 +154,28 @@ export default function FrequencyBandPanel({ value, onChange }: FrequencyBandPan
           </div>
         );
       })}
+
+      {/* Custom frequency input */}
+      <div className="flex gap-2">
+        <input
+          type="number"
+          placeholder="Custom MHz..."
+          value={customInput}
+          onChange={(e) => setCustomInput(e.target.value)}
+          onKeyDown={(e) => e.key === 'Enter' && handleCustomSubmit()}
+          className="flex-1 px-2.5 py-1.5 border border-gray-300 dark:border-dark-border dark:bg-dark-bg dark:text-dark-text rounded-md text-xs
+            focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
+          min={1}
+          max={100000}
+        />
+        <button
+          type="button"
+          onClick={handleCustomSubmit}
+          className="px-3 py-1.5 bg-gray-200 hover:bg-gray-300 dark:bg-dark-border dark:hover:bg-dark-muted dark:text-dark-text rounded-md text-xs text-gray-700 min-h-[28px]"
+        >
+          Set
+        </button>
+      </div>
     </div>
   );
 }
diff --git a/frontend/src/components/panels/HistoryPanel.tsx b/frontend/src/components/panels/HistoryPanel.tsx
new file mode 100644
index 0000000..95f8afb
--- /dev/null
+++ b/frontend/src/components/panels/HistoryPanel.tsx
@@ -0,0 +1,137 @@
+import { useState } from 'react';
+import { useCalcHistoryStore } from '@/store/calcHistory.ts';
+import type { CalculationEntry } from '@/store/calcHistory.ts';
+
+function EntryDetail({ entry }: { entry: CalculationEntry }) {
+  return (
+    <div className="mt-1.5 pt-1.5 border-t border-gray-100 dark:border-dark-border space-y-1.5 text-[10px]">
+      {/* Coverage breakdown with percentages */}
+      <div className="grid grid-cols-4 gap-1 text-center">
+        <div>
+          <div className="font-semibold text-blue-600 dark:text-blue-400">
+            {entry.coverage.excellent.toFixed(0)}%
+          </div>
+          <div className="text-gray-400">Excellent</div>
+        </div>
+        <div>
+          <div className="font-semibold text-green-600 dark:text-green-400">
+            {entry.coverage.good.toFixed(0)}%
+          </div>
+          <div className="text-gray-400">Good</div>
+        </div>
+        <div>
+          <div className="font-semibold text-yellow-600 dark:text-yellow-400">
+            {entry.coverage.fair.toFixed(0)}%
+          </div>
+          <div className="text-gray-400">Fair</div>
+        </div>
+        <div>
+          <div className="font-semibold text-red-600 dark:text-red-400">
+            {entry.coverage.weak.toFixed(0)}%
+          </div>
+          <div className="text-gray-400">Weak</div>
+        </div>
+      </div>
+
+      {/* RSRP details */}
+      <div className="flex justify-between text-gray-500 dark:text-dark-muted">
+        <span>Avg RSRP: {entry.avgRsrp.toFixed(1)} dBm</span>
+        <span>Range: {entry.rangeMin.toFixed(0)} / {entry.rangeMax.toFixed(0)} dBm</span>
+      </div>
+    </div>
+  );
+}
+
+export default function HistoryPanel() {
+  const entries = useCalcHistoryStore((s) => s.entries);
+  const clearHistory = useCalcHistoryStore((s) => s.clearHistory);
+  const [expanded, setExpanded] = useState(false);
+  const [expandedEntry, setExpandedEntry] = useState<string | null>(null);
+
+  if (entries.length === 0) return null;
+
+  return (
+    <div className="bg-white dark:bg-dark-surface border border-gray-200 dark:border-dark-border rounded-lg shadow-sm p-4">
+      <div className="flex items-center justify-between">
+        <button
+          onClick={() => setExpanded(!expanded)}
+          className="flex items-center gap-1 text-sm font-semibold text-gray-800 dark:text-dark-text"
+        >
+          <span className="text-[10px]">{expanded ? '\u25BC' : '\u25B6'}</span>
+          Session History
+          <span className="text-xs text-gray-400 dark:text-dark-muted font-normal ml-1">
+            ({entries.length})
+          </span>
+        </button>
+        {expanded && (
+          <button
+            onClick={clearHistory}
+            className="text-[10px] text-red-400 hover:text-red-600 dark:text-red-500 dark:hover:text-red-400 transition-colors"
+          >
+            Clear All
+          </button>
+        )}
+      </div>
+
+      {expanded && (
+        <div className="mt-2 space-y-1.5 max-h-80 overflow-y-auto">
+          {entries.map((entry) => {
+            const isOpen = expandedEntry === entry.id;
+            return (
+              <button
+                key={entry.id}
+                onClick={() => setExpandedEntry(isOpen ? null : entry.id)}
+                className="w-full text-left text-xs border border-gray-100 dark:border-dark-border rounded p-2 space-y-1 hover:bg-gray-50 dark:hover:bg-dark-bg transition-colors cursor-pointer"
+              >
+                {/* Row 1: timestamp + computation time */}
+                <div className="flex justify-between items-center">
+                  <span className="text-gray-500 dark:text-dark-muted">
+                    {entry.timestamp.toLocaleTimeString()}
+                  </span>
+                  <span className="font-bold text-gray-800 dark:text-dark-text">
+                    {entry.computationTime.toFixed(1)}s
+                  </span>
+                </div>
+
+                {/* Row 2: badges */}
+                <div className="flex gap-1.5 flex-wrap text-[10px]">
+                  <span className="px-1 py-0.5 bg-blue-50 dark:bg-blue-900/20 text-blue-700 dark:text-blue-300 rounded">
+                    {entry.preset}
+                  </span>
+                  <span className="text-gray-500 dark:text-dark-muted">
+                    {entry.totalPoints.toLocaleString()} pts
+                  </span>
+                  <span className="text-gray-500 dark:text-dark-muted">
+                    {entry.radius}km
+                  </span>
+                  <span className="text-gray-500 dark:text-dark-muted">
+                    {entry.resolution}m
+                  </span>
+                </div>
+
+                {/* Coverage bar */}
+                <div className="flex h-1.5 rounded-full overflow-hidden bg-gray-100 dark:bg-dark-border">
+                  {entry.coverage.excellent > 0 && (
+                    <div className="bg-blue-500" style={{ width: `${entry.coverage.excellent}%` }} />
+                  )}
+                  {entry.coverage.good > 0 && (
+                    <div className="bg-green-500" style={{ width: `${entry.coverage.good}%` }} />
+                  )}
+                  {entry.coverage.fair > 0 && (
+                    <div className="bg-yellow-500" style={{ width: `${entry.coverage.fair}%` }} />
+                  )}
+                  {entry.coverage.weak > 0 && (
+                    <div className="bg-red-500" style={{ width: `${entry.coverage.weak}%` }} />
+                  )}
+                </div>
+
+                {/* Expandable detail */}
+                {isOpen && <EntryDetail entry={entry} />}
+              </button>
+            );
+          })}
+        </div>
+      )}
+    </div>
+  );
+}
diff --git a/frontend/src/components/panels/ResultsPanel.tsx b/frontend/src/components/panels/ResultsPanel.tsx
new file mode 100644
index 0000000..239eca2
--- /dev/null
+++ b/frontend/src/components/panels/ResultsPanel.tsx
@@ -0,0 +1,163 @@
+import { useEffect, useState, useRef, useCallback } from 'react';
+import { useCoverageStore } from '@/store/coverage.ts';
+import type { CoverageResult } from '@/types/index.ts';
+
+function classifyCoverage(points: Array<{ rsrp: number }>) {
+  const counts = { excellent: 0, good: 0, fair: 0, weak: 0 };
+  for (const p of points) {
+    if (p.rsrp > -70) counts.excellent++;
+    else if (p.rsrp > -85) counts.good++;
+    else if (p.rsrp > -100) counts.fair++;
+    else counts.weak++;
+  }
+  return counts;
+}
+
+const AUTO_DISMISS_MS = 10_000;
+
+export default function ResultsPanel() {
+  const result = useCoverageStore((s) => s.result);
+  const [visible, setVisible] = useState(false);
+  const [show, setShow] = useState(false);
+  const timerRef = useRef<ReturnType<typeof setTimeout> | undefined>(undefined);
+  const prevResultRef = useRef<CoverageResult | null>(null);
+
+  const dismiss = useCallback(() => {
+    setVisible(false);
+    setTimeout(() => setShow(false), 300);
+  }, []);
+
+  useEffect(() => {
+    // Only trigger on NEW result (not initial mount with existing result)
+    if (result && result !== prevResultRef.current && result.points.length > 0) {
+      setShow(true);
+      requestAnimationFrame(() => setVisible(true));
+
+      if (timerRef.current) clearTimeout(timerRef.current);
+      timerRef.current = setTimeout(dismiss, AUTO_DISMISS_MS);
+    }
+    prevResultRef.current = result;
+
+    return () => {
+      if (timerRef.current) clearTimeout(timerRef.current);
+    };
+  }, [result, dismiss]);
+
+  if (!show || !result) return null;
+
+  const counts = classifyCoverage(result.points);
+  const total = result.points.length;
+  const preset = result.settings.preset ?? 'standard';
+  const timeStr = result.calculationTime.toFixed(1);
+
+  return (
+    <>
+      <style>{`@keyframes rfcp-shrink { from { width: 100%; } to { width: 0%; } }`}</style>
+      <div
+        className={`absolute top-4 left-4 z-[1000] w-72
+          bg-white/95 dark:bg-dark-surface/95 backdrop-blur-sm
+          border border-gray-200 dark:border-dark-border rounded-lg shadow-lg
+          transition-all duration-300 ease-out pointer-events-auto
+          ${visible ? 'opacity-100 translate-x-0' : 'opacity-0 -translate-x-8'}`}
+      >
+        {/* Header */}
+        <div className="flex items-center justify-between px-3 pt-3 pb-1">
+          <h3 className="text-xs font-semibold text-gray-700 dark:text-dark-text">
+            Calculation Complete
+          </h3>
+          <button
+            onClick={dismiss}
+            className="text-gray-400 hover:text-gray-600 dark:hover:text-dark-text text-sm leading-none"
+          >
+            &times;
+          </button>
+        </div>
+
+        {/* Body */}
+        <div className="px-3 pb-3 space-y-2">
+          {/* Time + points */}
+          <div className="flex items-baseline gap-2">
+            <span className="text-lg font-bold text-gray-800 dark:text-dark-text">
+              {timeStr}s
+            </span>
+            <span className="text-xs text-gray-500 dark:text-dark-muted">
+              {total.toLocaleString()} points
+            </span>
+          </div>
+
+          {/* Coverage breakdown bar */}
+          <div className="flex h-2 rounded-full overflow-hidden">
+            {counts.excellent > 0 && (
+              <div className="bg-blue-500" style={{ width: `${(counts.excellent / total) * 100}%` }} />
+            )}
+            {counts.good > 0 && (
+              <div className="bg-green-500" style={{ width: `${(counts.good / total) * 100}%` }} />
+            )}
+            {counts.fair > 0 && (
+              <div className="bg-yellow-500" style={{ width: `${(counts.fair / total) * 100}%` }} />
+            )}
+            {counts.weak > 0 && (
+              <div className="bg-red-500" style={{ width: `${(counts.weak / total) * 100}%` }} />
+            )}
+          </div>
+
+          {/* Coverage percentages */}
+          <div className="grid grid-cols-4 gap-1 text-center text-[10px]">
+            <div>
+              <div className="font-semibold text-blue-600 dark:text-blue-400">
+                {total > 0 ? ((counts.excellent / total) * 100).toFixed(0) : 0}%
+              </div>
+              <div className="text-gray-400">Exc</div>
+            </div>
+            <div>
+              <div className="font-semibold text-green-600 dark:text-green-400">
+                {total > 0 ? ((counts.good / total) * 100).toFixed(0) : 0}%
+              </div>
+              <div className="text-gray-400">Good</div>
+            </div>
+            <div>
+              <div className="font-semibold text-yellow-600 dark:text-yellow-400">
+                {total > 0 ? ((counts.fair / total) * 100).toFixed(0) : 0}%
+              </div>
+              <div className="text-gray-400">Fair</div>
+            </div>
+            <div>
+              <div className="font-semibold text-red-600 dark:text-red-400">
+                {total > 0 ? ((counts.weak / total) * 100).toFixed(0) : 0}%
+              </div>
+              <div className="text-gray-400">Weak</div>
+            </div>
+          </div>
+
+          {/* Metadata */}
+          <div className="flex flex-wrap gap-1.5 text-[10px] text-gray-500 dark:text-dark-muted">
+            <span className="px-1.5 py-0.5 bg-gray-100 dark:bg-dark-border rounded">
+              {preset}
+            </span>
+            <span className="px-1.5 py-0.5 bg-gray-100 dark:bg-dark-border rounded">
+              {result.settings.radius}km
+            </span>
+            <span className="px-1.5 py-0.5 bg-gray-100 dark:bg-dark-border rounded">
+              {result.settings.resolution}m
+            </span>
+            {result.modelsUsed && result.modelsUsed.length > 0 && (
+              <span className="px-1.5 py-0.5 bg-gray-100 dark:bg-dark-border rounded">
+                {result.modelsUsed.length} models
+              </span>
+            )}
+          </div>
+        </div>
+
+        {/* Auto-dismiss progress bar */}
+        <div className="h-0.5 bg-gray-100 dark:bg-dark-border rounded-b-lg overflow-hidden">
+          <div
+            className="h-full bg-blue-400 dark:bg-blue-500"
+            style={{
+              animation: `rfcp-shrink ${AUTO_DISMISS_MS}ms linear forwards`,
+            }}
+          />
+        </div>
+      </div>
+    </>
+  );
+}
diff --git a/frontend/src/services/websocket.ts b/frontend/src/services/websocket.ts
index 0ec95a6..b085d75 100644
--- a/frontend/src/services/websocket.ts
+++ b/frontend/src/services/websocket.ts
@@ -33,6 +33,7 @@ interface PendingCalc {
 class WebSocketService {
   private ws: WebSocket | null = null;
   private reconnectTimer: ReturnType<typeof setTimeout> | undefined;
+  private pingTimer: ReturnType<typeof setInterval> | undefined;
   private _connected = false;
   private _pendingCalcs = new Map<string, PendingCalc>();
   private _connectionListeners = new Set<ConnectionCallback>();
@@ -70,10 +71,20 @@ class WebSocketService {
 
     this.ws.onopen = () => {
       this._setConnected(true);
+      // Keepalive pings every 30s to prevent connection timeout during long calculations
+      if (this.pingTimer) clearInterval(this.pingTimer);
+      this.pingTimer = setInterval(() => {
+        if (this.ws?.readyState === WebSocket.OPEN) {
+          this.ws.send(JSON.stringify({ type: 'ping' }));
+        }
+      }, 30_000);
     };
 
     this.ws.onclose = () => {
       this._setConnected(false);
+      if (this.pingTimer) { clearInterval(this.pingTimer); this.pingTimer = undefined; }
+      // Fail all pending calculations — their callbacks reference the old socket
+      this._failPendingCalcs('WebSocket disconnected');
       this.reconnectTimer = setTimeout(() => this.connect(), 2000);
     };
 
@@ -121,8 +132,18 @@ class WebSocketService {
     };
   }
 
+  /** Fail all pending calculations (e.g. on disconnect). */
+  private _failPendingCalcs(reason: string): void {
+    for (const [calcId, pending] of this._pendingCalcs) {
+      try { pending.onError(reason); } catch { /* ignore */ }
+      this._pendingCalcs.delete(calcId);
+    }
+  }
+
   disconnect(): void {
     if (this.reconnectTimer) clearTimeout(this.reconnectTimer);
+    if (this.pingTimer) { clearInterval(this.pingTimer); this.pingTimer = undefined; }
+    this._failPendingCalcs('WebSocket disconnected');
     this.ws?.close();
     this.ws = null;
     this._setConnected(false);
diff --git a/frontend/src/store/calcHistory.ts b/frontend/src/store/calcHistory.ts
new file mode 100644
index 0000000..f5a271f
--- /dev/null
+++ b/frontend/src/store/calcHistory.ts
@@ -0,0 +1,38 @@
+import { create } from 'zustand';
+
+export interface CalculationEntry {
+  id: string;
+  timestamp: Date;
+  preset: string;
+  radius: number;
+  resolution: number;
+  computationTime: number;
+  totalPoints: number;
+  coverage: { excellent: number; good: number; fair: number; weak: number };
+  avgRsrp: number;
+  rangeMin: number;
+  rangeMax: number;
+}
+
+interface CalcHistoryState {
+  entries: CalculationEntry[];
+  addEntry: (entry: CalculationEntry) => void;
+  clearHistory: () => void;
+}
+
+const MAX_ENTRIES = 50;
+
+export const useCalcHistoryStore = create<CalcHistoryState>((set) => ({
+  entries: [],
+
+  addEntry: (entry) =>
+    set((state) => {
+      const entries = [entry, ...state.entries];
+      if (entries.length > MAX_ENTRIES) {
+        entries.length = MAX_ENTRIES;
+      }
+      return { entries };
+    }),
+
+  clearHistory: () => set({ entries: [] }),
+}));
diff --git a/frontend/src/store/coverage.ts b/frontend/src/store/coverage.ts
index 7746283..d55c547 100644
--- a/frontend/src/store/coverage.ts
+++ b/frontend/src/store/coverage.ts
@@ -3,6 +3,9 @@ import { api } from '@/services/api.ts';
 import { wsService } from '@/services/websocket.ts';
 import type { WSProgress } from '@/services/websocket.ts';
 import { useSitesStore } from '@/store/sites.ts';
+import { useToastStore } from '@/components/ui/Toast.tsx';
+import { useCalcHistoryStore } from '@/store/calcHistory.ts';
+import type { CalculationEntry } from '@/store/calcHistory.ts';
 import type { CoverageResult, CoverageSettings, CoverageApiStats } from '@/types/index.ts';
 import type { ApiSiteParams, CoverageResponse } from '@/services/api.ts';
 
@@ -49,7 +52,7 @@ function buildApiSettings(settings: CoverageSettings) {
   return {
     radius: settings.radius * 1000, // km → meters
     resolution: settings.resolution,
-    min_signal: settings.rsrpThreshold,
+    min_signal: -130, // Send all useful points; frontend filters visually via rsrpThreshold
     preset: settings.preset,
     use_terrain: settings.use_terrain,
     use_buildings: settings.use_buildings,
@@ -92,6 +95,44 @@ function responseToResult(response: CoverageResponse, settings: CoverageSettings
   };
 }
 
+function buildHistoryEntry(result: CoverageResult): CalculationEntry {
+  const counts = { excellent: 0, good: 0, fair: 0, weak: 0 };
+  let minRsrp = Infinity;
+  let maxRsrp = -Infinity;
+
+  for (const p of result.points) {
+    if (p.rsrp > -70) counts.excellent++;
+    else if (p.rsrp > -85) counts.good++;
+    else if (p.rsrp > -100) counts.fair++;
+    else counts.weak++;
+    if (p.rsrp < minRsrp) minRsrp = p.rsrp;
+    if (p.rsrp > maxRsrp) maxRsrp = p.rsrp;
+  }
+
+  const total = result.points.length;
+  const avgRsrp = result.stats?.avg_rsrp
+    ?? (total > 0 ? result.points.reduce((s, p) => s + p.rsrp, 0) / total : 0);
+
+  return {
+    id: crypto.randomUUID(),
+    timestamp: new Date(),
+    preset: result.settings.preset ?? 'standard',
+    radius: result.settings.radius,
+    resolution: result.settings.resolution,
+    computationTime: result.calculationTime,
+    totalPoints: result.totalPoints,
+    coverage: {
+      excellent: total > 0 ? (counts.excellent / total) * 100 : 0,
+      good: total > 0 ? (counts.good / total) * 100 : 0,
+      fair: total > 0 ? (counts.fair / total) * 100 : 0,
+      weak: total > 0 ? (counts.weak / total) * 100 : 0,
+    },
+    avgRsrp,
+    rangeMin: minRsrp === Infinity ? 0 : minRsrp,
+    rangeMax: maxRsrp === -Infinity ? 0 : maxRsrp,
+  };
+}
+
 export const useCoverageStore = create<CoverageState>((set, get) => ({
   result: null,
   isCalculating: false,
@@ -163,12 +204,36 @@ export const useCoverageStore = create<CoverageState>((set, get) => ({
         apiSettings as unknown as Record<string, unknown>,
         // onResult
         (data) => {
-          const result = responseToResult(data, settings);
-          set({ result, isCalculating: false, error: null, progress: null, activeCalcId: null });
+          try {
+            const result = responseToResult(data, settings);
+            set({ result, isCalculating: false, error: null, progress: null, activeCalcId: null });
+            // Show success toast for WS result
+            const addToast = useToastStore.getState().addToast;
+            if (result.points.length === 0) {
+              addToast('No coverage points. Try increasing radius.', 'warning');
+            } else {
+              const timeStr = result.calculationTime.toFixed(1);
+              const modelsStr = result.modelsUsed?.length
+                ? ` \u2022 ${result.modelsUsed.length} models`
+                : '';
+              addToast(
+                `Calculated ${result.totalPoints.toLocaleString()} points in ${timeStr}s${modelsStr}`,
+                'success'
+              );
+            }
+            // Push to session history
+            if (result.points.length > 0) {
+              useCalcHistoryStore.getState().addEntry(buildHistoryEntry(result));
+            }
+          } catch (err) {
+            console.error('[Coverage] Failed to process result:', err);
+            set({ isCalculating: false, error: 'Failed to process coverage result', progress: null, activeCalcId: null });
+          }
         },
         // onError
         (error) => {
           set({ isCalculating: false, error, progress: null, activeCalcId: null });
+          useToastStore.getState().addToast(`Calculation failed: ${error}`, 'error');
         },
         // onProgress
         (progress) => {
@@ -191,6 +256,10 @@ export const useCoverageStore = create<CoverageState>((set, get) => ({
 
       const result = responseToResult(response, settings);
       set({ result, isCalculating: false, error: null });
+      // Push to session history
+      if (result.points.length > 0) {
+        useCalcHistoryStore.getState().addEntry(buildHistoryEntry(result));
+      }
     } catch (err) {
       if (err instanceof Error && err.name === 'AbortError') {
         set({ isCalculating: false });
diff --git a/frontend/src/utils/colorGradient.ts b/frontend/src/utils/colorGradient.ts
index 7d6341a..ef27626 100644
--- a/frontend/src/utils/colorGradient.ts
+++ b/frontend/src/utils/colorGradient.ts
@@ -1,10 +1,11 @@
 /**
  * RSRP → color mapping with smooth gradient interpolation.
  *
- * Purple → Orange palette:
- *   -130 dBm = deep purple (no service)
- *    -90 dBm = peach (fair)
- *    -50 dBm = bright orange (excellent)
+ * CloudRF-style Red → Blue palette:
+ *   -130 dBm = dark red (no service)
+ *   -100 dBm = yellow (fair)
+ *    -70 dBm = green (good)
+ *    -50 dBm = deep blue (excellent)
  *
  * All functions are pure and allocation-free on the hot path
  * (pre-built lookup table for fast per-pixel color resolution).
@@ -18,14 +19,13 @@ interface GradientStop {
 }
 
 const GRADIENT_STOPS: GradientStop[] = [
-  { value: 0.0, r: 26, g: 0, b: 51 },       // #1a0033 — deep purple (no service)
-  { value: 0.15, r: 74, g: 20, b: 140 },     // #4a148c — dark purple
-  { value: 0.30, r: 123, g: 31, b: 162 },    // #7b1fa2 — purple (very weak)
-  { value: 0.45, r: 171, g: 71, b: 188 },    // #ab47bc — light purple (weak)
-  { value: 0.60, r: 255, g: 138, b: 101 },   // #ff8a65 — peach (fair)
-  { value: 0.75, r: 255, g: 111, b: 0 },     // #ff6f00 — dark orange (good)
-  { value: 0.85, r: 255, g: 152, b: 0 },     // #ff9800 — orange (strong)
-  { value: 1.0, r: 255, g: 183, b: 77 },     // #ffb74d — bright orange (excellent)
+  { value: 0.0,  r: 127, g: 0,   b: 0   },   // #7f0000 — dark red (no service)
+  { value: 0.15, r: 239, g: 68,  b: 68  },   // #EF4444 — red (very weak)
+  { value: 0.30, r: 249, g: 115, b: 22  },   // #F97316 — orange (weak)
+  { value: 0.50, r: 234, g: 179, b: 8   },   // #EAB308 — yellow (fair)
+  { value: 0.70, r: 34,  g: 197, b: 94  },   // #22C55E — green (good)
+  { value: 0.85, r: 59,  g: 130, b: 246 },   // #3B82F6 — blue (strong)
+  { value: 1.0,  r: 37,  g: 99,  b: 235 },   // #2563EB — deep blue (excellent)
 ];
 
 /**
diff --git a/installer/detailed-result.json b/installer/detailed-result.json
index 9814f22..e8ff401 100644
--- a/installer/detailed-result.json
+++ b/installer/detailed-result.json
@@ -1 +1 @@
-{"detail":"Calculation timeout (5 min). Cleaned up 4 workers."}
\ No newline at end of file
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