feat: optimize Banner Performance with Lazy Loading #3351
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (1)
components/campaigns/AnnouncementHero.tsx (1)
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65-84: Consider additional performance optimizationsWhile the lazy loading implementation reduces DOM nodes, the Lighthouse score indicates room for improvement. Consider these additional optimizations:
- Implement virtual scrolling or windowing using a library like
react-window- Add
will-changeCSS property to optimize animations- Use CSS transform instead of DOM manipulation for transitions
Would you like me to provide example implementations for any of these suggestions?
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components/campaigns/AnnouncementHero.tsx(2 hunks)
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components/campaigns/AnnouncementHero.tsx
[error] 84-84: Insert ····
(prettier/prettier)
🔇 Additional comments (1)
components/campaigns/AnnouncementHero.tsx (1)
Line range hint 65-84: Verify performance impact with React DevTools
The current implementation might still cause unnecessary re-renders of hidden banners.
Let's analyze the component's render behavior:
Consider wrapping the Banner component with React.memo to prevent unnecessary re-renders:
const MemoizedBanner = React.memo(Banner);| // Only render active banner and immediate neighbors | ||
| const isVisible = Math.abs(index - (activeIndex % numberOfVisibleBanners)) <= 1; | ||
| if (!isVisible) return null; |
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🛠️ Refactor suggestion
Improve code readability with a dedicated visibility check function
The visibility calculation logic could be more maintainable and self-documenting.
Consider extracting the visibility logic:
+ const isBannerVisible = (index: number, activeIndex: number, total: number) => {
+ const normalizedIndex = activeIndex % total;
+ return Math.abs(index - normalizedIndex) <= 1;
+ };
{visibleBanners.map((banner, index) => {
- const isVisible = Math.abs(index - (activeIndex % numberOfVisibleBanners)) <= 1;
+ const isVisible = isBannerVisible(index, activeIndex, numberOfVisibleBanners);
if (!isVisible) return null;📝 Committable suggestion
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Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| // Only render active banner and immediate neighbors | |
| const isVisible = Math.abs(index - (activeIndex % numberOfVisibleBanners)) <= 1; | |
| if (!isVisible) return null; | |
| const isBannerVisible = (index: number, activeIndex: number, total: number) => { | |
| const normalizedIndex = activeIndex % total; | |
| return Math.abs(index - normalizedIndex) <= 1; | |
| }; | |
| // Only render active banner and immediate neighbors | |
| const isVisible = isBannerVisible(index, activeIndex, numberOfVisibleBanners); | |
| if (!isVisible) return null; |
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #3351 +/- ##
=======================================
Coverage 49.14% 49.14%
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Files 21 21
Lines 647 647
=======================================
Hits 318 318
Misses 329 329 ☔ View full report in Codecov by Sentry. |
Optimizes banner rendering performance to improve the Lighthouse score by implementing lazy loading for inactive banners. Only renders the active banner and immediate neighbors instead of all banners at once.
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After:
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solves this issue
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New Features
Bug Fixes