Performance impacts user experience directly. Here are proven patterns to optimize React apps.
Avoid Unnecessary Re-renders
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Memoize Callbacks
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List Virtualization
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Debounce and Throttle
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Code Splitting
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Image Optimization
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State Colocation
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Avoid Layout Thrashing
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Profiling
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Bundle Optimization
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Best Practices
Rendering:
✓ Use React.memo for expensive components
✓ Memoize callbacks and objects
✓ Keep state as local as possible
✓ Use keys properly in lists
Data:
✓ Debounce user input
✓ Virtualize long lists
✓ Paginate or infinite scroll
✓ Cache API responses
Bundle:
✓ Code split by route
✓ Lazy load heavy components
✓ Tree shake imports
✓ Analyze bundle regularly
Conclusion
React performance optimization focuses on minimizing unnecessary work: re-renders, network requests, and bundle size. Use profiling tools to identify bottlenecks, apply memoization strategically, and code split to reduce initial load. Most importantly, measure before and after optimizing to ensure real improvements.