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- Replace mapped list with react-window FixedSizeList - Add useContainerDimensions and useWindowWidth hooks for responsive sizing - Refactor page layout to flex column for proper list containment - Remove heavy entry/exit animations for list items Co-authored-by: Asutorufa <16442314+Asutorufa@users.noreply.github.com>
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Summary of ChangesHello @Asutorufa, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request delivers a crucial performance upgrade to the connections list by integrating Highlights
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Code Review
This pull request effectively addresses a performance bottleneck by virtualizing the connections list using react-window. The implementation is solid, correctly using ResizeObserver and flexbox to create a responsive, dynamically-sized list. The code is clean and the approach is sound. I've added a couple of suggestions to further improve the new utility hooks for better maintainability and to optimize for performance by preventing unnecessary re-renders. Overall, this is an excellent enhancement.
src/docs/connections/v2/page.tsx
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| const observer = new ResizeObserver(entries => { | ||
| if (!entries || entries.length === 0) return; | ||
| const { width, height } = entries[0].contentRect; | ||
| setDimensions({ width, height }); | ||
| }); |
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To prevent unnecessary re-renders, it's a good practice to update the state only when the dimensions have actually changed. The current implementation creates a new object for dimensions on every ResizeObserver callback, which will always trigger a re-render of the component using this hook, even if the size is identical.
const observer = new ResizeObserver(entries => {
if (!entries?.[0]) return;
const { width, height } = entries[0].contentRect;
setDimensions(currentDimensions => {
if (currentDimensions.width === width && currentDimensions.height === height) {
return currentDimensions;
}
return { width, height };
});
});
References
- To prevent unnecessary re-renders, ensure that state updates for objects only occur when the values actually change, and return the existing object reference if no change is detected. This aligns with the principle of maintaining stable references to prevent re-renders, similar to how
useMemoshould return stable object references.
There was a problem hiding this comment.
To prevent unnecessary re-renders, it's a good practice to update the state only when the dimensions have actually changed. The current implementation creates a new object for
dimensionson everyResizeObservercallback, which will always trigger a re-render of the component using this hook, even if the size is identical.const observer = new ResizeObserver(entries => { if (!entries?.[0]) return; const { width, height } = entries[0].contentRect; setDimensions(currentDimensions => { if (currentDimensions.width === width && currentDimensions.height === height) { return currentDimensions; } return { width, height }; }); });References
There was a problem hiding this comment.
To prevent unnecessary re-renders, it's a good practice to update the state only when the dimensions have actually changed. The current implementation creates a new object for
dimensionson everyResizeObservercallback, which will always trigger a re-render of the component using this hook, even if the size is identical.const observer = new ResizeObserver(entries => { if (!entries?.[0]) return; const { width, height } = entries[0].contentRect; setDimensions(currentDimensions => { if (currentDimensions.width === width && currentDimensions.height === height) { return currentDimensions; } return { width, height }; }); });References
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Updated useContainerDimensions in src/common/hooks.ts to only update state when dimensions actually change, preventing unnecessary re-renders.
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Updated useContainerDimensions to implement the suggested state update optimization.
- Replace mapped list with react-window FixedSizeList for O(1) rendering - Move useContainerDimensions and useWindowWidth to src/common/hooks.ts - Refactor Connections page layout to flex column for proper list containment - Remove heavy entry/exit animations for list items Co-authored-by: Asutorufa <16442314+Asutorufa@users.noreply.github.com>
- Update import from FixedSizeList to List to match installed react-window version Co-authored-by: Asutorufa <16442314+Asutorufa@users.noreply.github.com>
- Implement state update optimization in useContainerDimensions to prevent unnecessary re-renders when dimensions remain unchanged. Co-authored-by: Asutorufa <16442314+Asutorufa@users.noreply.github.com>
1 participant
react-window'sFixedSizeListinsrc/docs/connections/v2/page.tsx.motion.licomponents caused significant lag and high memory usage.FixedSizeListfor O(1) rendering relative to viewport.useWindowWidth.Connectionspage layout to use flexbox andResizeObserver(viauseContainerDimensions) to ensure the list fills the available vertical space correctly.AnimatePresenceand entry/exit animations for list items as they are incompatible with virtualization performance goals, but retained hover effects.benchmark_repro.tsxwhich confirmed the O(N) mounting cost of the original implementation.PR created automatically by Jules for task 17591614436217613194 started by @Asutorufa