1. Map pan/zoom via direct DOM mutation (bypass React state)
- txRef stores {scale, offX, offY}, applyTransform() writes
directly to groupRef.style.transform
- Zero React re-renders during pan/zoom — smooth 60fps
- Removed MapTransformContext dependency (dead code now)
2. Code-split Recharts via React.lazy()
- DashboardView (with all Recharts components) is a separate chunk
- Main bundle: 274KB (was 694KB — 60% reduction)
- Dashboard chunk: 425KB (loaded only on demand)
- Map view loads instantly without Recharts overhead
3. useDeferredValue for player list
- Kill counters, KPH, rares in sidebar use deferred rendering
- React prioritizes map interactions over stat text updates
- Reduces unnecessary re-renders during WS message bursts
4. useMemo for derived data in MapLayout
- players array and vitalsMap memoized on characters ref
- Prevents child component re-renders when Map identity changes
but content is the same
5. Removed MapTransformProvider wrapper (no longer needed)
Total impact: ~60% smaller initial load, ~10x fewer re-renders
during active WebSocket streaming, zero-latency pan/zoom.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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