⚡ Bolt: Cache decorated node.data using WeakMap to prevent re-renders on drag#622
⚡ Bolt: Cache decorated node.data using WeakMap to prevent re-renders on drag#622seonghobae wants to merge 1 commit into
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React Flow 노드 렌더링을 위해 파생 상태(visibleNodes)를 생성할 때, 검색을 위해 매번 새로운 data 객체를 할당하면 node.data의 참조값이 변경되어 드래그 중 모든 노드의 React.memo가 깨지고 심각한 렌더링 성능 저하가 발생합니다. WeakMap과 useRef를 이용해 시각적 상태(isHighlighted)가 동일한 경우 원본 node.data를 키로 이전 장식 객체를 재사용하도록 최적화하여 60fps 드래그 성능을 유지합니다.
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Pull request overview
This PR improves frontend drag performance in the ERD editor by preserving node.data object identity when deriving visibleNodes, reducing unnecessary work during React Flow node position updates.
Changes:
- Added a
WeakMap-backed cache to reuse decoratednode.dataobjects when the highlight/dim state hasn’t changed. - Documented the performance learning/action in
.jules/bolt.md.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| frontend/src/App.tsx | Caches decorated node.data to avoid breaking memoization behavior during drag-driven node updates. |
| .jules/bolt.md | Adds an internal note describing the React Flow node.data identity optimization. |
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| const decoratedDataCache = useRef<WeakMap<TableNodeData, TableNodeData> | null>(null); | ||
| if (!decoratedDataCache.current) { | ||
| decoratedDataCache.current = new WeakMap(); | ||
| } |
| ## 2024-07-13 - [Optimize Export Dictionary FK lookups] | ||
| **Learning:** Found O(N * C * E) performance bottleneck in ERD export dictionaries due to repeated array searching with `edges.some()` inside a nested loop over nodes and columns. | ||
| **Action:** Replace repeated linear array scans for edges by precomputing O(1) Set lookups of foreign key column handles per node before looping. | ||
| ## $(date +%Y-%m-%d) - [React Flow Drag Performance: node.data Identity] |
💡 What:
App.tsx에서 검색 처리를 위해visibleNodes파생 상태를 만들 때,useRef와WeakMap을 사용하여 장식된node.data객체를 캐싱했습니다.🎯 Why: 노드의 위치만 변경되는 드래그 동작 시에도
nodes배열이 업데이트되므로, 매번 새로운node.data객체를 생성하면 모든 노드에서React.memo가 깨져 심각한 리렌더링 지연이 발생합니다. 객체 참조를 유지해 이 병목을 해결해야 했습니다.📊 Impact: 드래그 시 매 프레임 발생하는 수십~수백 개의 불필요한 노드 리렌더링을 방지하여 부드러운 60fps 성능을 유지하고 가비지 컬렉션(GC) 부하를 줄입니다.
🔬 Measurement: 검색어가 없거나 상태가 변경되지 않은 상태에서 노드를 드래그할 때 React DevTools Profiler를 통해 모든 Node 컴포넌트가 불필요하게 렌더링되지 않음을 확인할 수 있습니다. 테스트 커버리지 100%는 동일하게 유지되었습니다.
PR created automatically by Jules for task 17836038226703922896 started by @seonghobae