⚡ Bolt: [performance improvement] Optimize Experience and Education list rendering#393
⚡ Bolt: [performance improvement] Optimize Experience and Education list rendering#393aafre wants to merge 1 commit into
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…ist rendering Extracts items from ExperienceSection and EducationSection into memoized child components (`ExperienceItem` and `EducationItem`). This ensures that only individual list items re-render when their respective fields change, significantly improving editor performance for large resumes. Callbacks passed to children are stabilized using `useCallback` paired with a state ref maintained via `useLayoutEffect`, avoiding stale closures during rapid typing. Co-authored-by: aafre <8656674+aafre@users.noreply.github.com>
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Summary of ChangesHello, 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 introduces significant performance improvements to the rendering of experience and education lists within the UI. By refactoring list items into memoized child components and stabilizing their associated callbacks, the application now avoids widespread re-renders, leading to a more responsive and efficient user experience, especially when editing individual entries in larger sections. Highlights
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Code Review
The pull request refactors EducationSection and ExperienceSection components to improve rendering performance. This was achieved by extracting individual EducationItem and ExperienceItem components, memoizing them with React.memo, and stabilizing their callback props using useCallback and the useRef/useLayoutEffect pattern to ensure stable references across renders. A new learning entry was added to .jules/bolt.md documenting this useRef/useLayoutEffect pattern. A review comment highlights a remaining performance anti-pattern within the ExperienceItem component's description list, suggesting further memoization for individual description points as a potential follow-up.
| {experience.description.map((desc, descIndex) => ( | ||
| <SortableItem | ||
| key={itemIds[descIndex]} | ||
| id={itemIds[descIndex]} | ||
| > | ||
| <div className="flex items-start gap-3"> | ||
| <div className="flex-1"> | ||
| <RichTextInput | ||
| value={desc} | ||
| onChange={(value) => onUpdateDescription(index, descIndex, value)} | ||
| placeholder="Describe your responsibilities, achievements, or key projects..." | ||
| className="w-full border border-gray-300 rounded-lg p-3 focus-within:ring-2 focus-within:ring-accent focus-within:border-accent transition-all duration-200" | ||
| /> | ||
| </div> | ||
| <button | ||
| onClick={() => onDeleteDescription(index, descIndex)} | ||
| className="text-red-600 hover:text-red-800 p-2 hover:bg-red-50 rounded-lg transition-colors flex-shrink-0 mt-2" | ||
| title="Remove description point" | ||
| > | ||
| ✕ | ||
| </button> | ||
| </div> | ||
| </SortableItem> | ||
| ))} |
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The .map over experience.description uses inline arrow functions for the onChange and onClick handlers. This creates new functions on every render of the ExperienceItem, which is the same performance anti-pattern this PR is fixing for the parent list. When one description point is edited, all description points within the same experience item will re-render, which could cause typing latency if an experience has many bullet points.
To fully apply the optimization pattern, consider extracting the description item into its own memoized component (e.g., DescriptionItem) and passing useCallback-memoized handlers. If this refactor is too large for the current PR, consider creating a follow-up task.
References
- For performance optimizations in list-based UIs, such as memoizing components and using
useCallbackfor handlers, create a follow-up task if the refactor is too large for the current pull request.
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💡 What:
Extracted list items in
ExperienceSectionandEducationSectioninto memoized child components (ExperienceItemandEducationItem). The callbacks passed to these child components are stabilized usinguseCallbackand auseRefthat holds the current state, updated viauseLayoutEffect.🎯 Why:
Previously, the inline
.maparrow callbacks caused all items within a section to re-render whenever any item was updated. As these sections become larger or more complex, this causes noticeable typing latency.📊 Impact:
Reduces re-renders significantly. When updating a single field inside an experience or education item, only that specific item will re-render rather than the entire list of items within the section.
🔬 Measurement:
Run the application and monitor React DevTools Profiler while typing into an Experience or Education field. Only the focused component will highlight as updated.
PR created automatically by Jules for task 10184515758454359233 started by @aafre