⚡ Bolt: Optimize React rendering in Chat and Map components#532
⚡ Bolt: Optimize React rendering in Chat and Map components#532ngoiyaeric wants to merge 1 commit intomainfrom
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This PR implements two performance optimizations: 1. Memoized `MapDataProvider` context value in `components/map/map-data-context.tsx` to prevent unnecessary re-renders of map data consumers when the provider's parent re-renders. 2. Replaced `showEmptyScreen` state/effect with a derived variable in `components/chat.tsx` to eliminate an extra render cycle and reduce state complexity. These changes improve overall app responsiveness, especially during map interactions and message updates. Co-authored-by: ngoiyaeric <115367894+ngoiyaeric@users.noreply.github.com>
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Overall the changes are solid performance improvements. The only actionable concern is making the useMemo dependency array in MapDataProvider more explicit by including setMapData to keep the pattern robust and less error-prone when replicated.
Additional notes (1)
- Maintainability |
components/map/map-data-context.tsx:41-48
The memoization dependency list is incomplete:useMemo(() => ({ mapData, setMapData }), [mapData])also closes oversetMapData. While React state setters are stable, omitting it makes the memoization contract less explicit and can trip exhaustive-deps tooling in other contexts, and it’s easy to cargo-cult this pattern incorrectly elsewhere.
Also note that this memoization only helps if consumers use referential equality (or if React re-renders due to context value identity changes). Being explicit here makes intent clear.
Summary of changes
Summary
This PR introduces targeted React rendering optimizations:
- Chat UI: Replaced
useState+useEffectforshowEmptyScreenwith a derived boolean (messages.length === 0) to avoid an extra render cycle. - Map context: Added
useMemoto memoize theMapDataContextprovider value instead of passing an object literal inline, reducing unnecessary consumer re-renders. - Docs: Added a brief learning note in
.jules/bolt.mdcapturing the rationale and guidance.
Files touched: components/chat.tsx, components/map/map-data-context.tsx, .jules/bolt.md.
2 participants
Implemented React performance optimizations to reduce unnecessary re-renders. Memoized the MapDataContext value and converted redundant state into a derived variable.
PR created automatically by Jules for task 11278673572113790341 started by @ngoiyaeric