Performance: Issues Identified (72-75) and Recommendations

## Performance Issues (72-75)

### 1. Document Request Latency
- **Estimated savings**: 1,320 ms
- **Observation**: Server responded slowly (observed 1,422ms).

### 2. Render Blocking Request
- **Estimated savings**: 230 ms

### 3. Network Dependency Tree
- `/dashboard/api-keys` - time: 1,642ms
- `app/layout.css?v=176` - time: 1,809ms
- `css/all.min.css` (cdnjs.cloudflare.com) - time: 1,759ms

### 4. Use Efficient Cache Lifetimes
- **Estimated savings**: ~1 KiB
- `supabase.co` (scripts/route-messenger.js)

### 5. Legacy JavaScript
- **Estimated savings**: ~9 KiB
- `…chunks/main-app.js?v=176` 9.4 KiB

### 6. Reduce Unused CSS
- **Estimated savings**: ~18 KiB
- Cloudflare CDN `css/all.min.css` (cdnjs.cloudflare.com): 18.3 KiB unused

### 7. Page Prevented Back/Forward Cache Restoration (4 Failure Reasons)
- **Reason**: Pages with WebSocket cannot enter back/forward cache. (**Type**: Pending browser support)
- **Reason**: Pages whose main resource has `cache-control: no-store` cannot enter back/forward cache. (**Type**: Not actionable)
- **Reason**: Back/forward cache is disabled because some JavaScript network request received resource with `Cache-Control: no-store` header. (**Type**: Not actionable)
- **Reason**: WebSocketUsedWithCCNS. (**Type**: Not actionable)