SawatoMosswartsEnjoyersClub/MosswartOverlord
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perf(v2): comprehensive performance optimizations

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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>
This commit is contained in:
Erik 2026-04-12 22:46:54 +02:00
parent 851fc5f7cd
commit 85dce15d8b
10 changed files with 251 additions and 210 deletions
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9
frontend/src/components/map/Sidebar.tsx
View file

@ -1,4 +1,4 @@
import React, { useState, useMemo } from 'react';
import React, { useState, useMemo, useDeferredValue } from 'react';
import { PlayerList } from '../sidebar/PlayerList';
import { SortButtons, type SortKey } from '../sidebar/SortButtons';
import { SidebarWindowButtons } from '../sidebar/SidebarWindowButtons';
@ -32,8 +32,11 @@ export const Sidebar: React.FC<Props> = ({
const isOnline = serverHealth?.status?.toLowerCase() === 'online' || serverHealth?.status?.toLowerCase() === 'up';
// Defer player list rendering — kill counters don't need 30fps updates
const deferredPlayers = useDeferredValue(players);
const sorted = useMemo(() => {
let list = [...players];
let list = [...deferredPlayers];
if (filter) list = list.filter(p => p.character_name.toLowerCase().startsWith(filter.toLowerCase()));
switch (sortKey) {
case 'kph': list.sort((a, b) => (parseInt(b.kills_per_hour) || 0) - (parseInt(a.kills_per_hour) || 0)); break;
@ -48,7 +51,7 @@ export const Sidebar: React.FC<Props> = ({
default: list.sort((a, b) => a.character_name.localeCompare(b.character_name));
}
return list;
}, [players, sortKey, filter]);
}, [deferredPlayers, sortKey, filter]);
return (
<div className="ml-sidebar">