Nikolas Syring fbc8103034 perf: Critical performance & stability fixes ...

Frontend:
- Lazy load SyntaxHighlighter via React.lazy() - saves ~500KB from initial bundle
- Add LazyCodeBlock wrapper with Suspense fallback
- Main bundle now 448KB instead of 1.1MB

Backend:
- Implement WebSocket message queue with backpressure handling
- Add heartbeat timeout check (60s) to detect zombie connections
- Add process startup timeout (30s) and max lifetime (24h)
- Fix restart race condition with timeout fallback
- Replace sessions Map with LRU Map (max 100 sessions)
- Add periodic cleanup for idle sessions (4h)
- Track session activity timestamps

These changes address critical issues identified in performance analysis:
- No more unbounded memory growth from sessions
- No more stuck isRestarting state
- No more message drops during heavy Claude output
- No more zombie WebSocket connections
- Faster initial page load

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-20 15:41:17 +01:00

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