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Slow apps lose money. A 1 second delay drops conversions by 7%. Amazon saw a 1% revenue increase with a 100ms improvement. 53% of mobile users leave if a page takes over 3 seconds to load.
React apps get slow when you make them do extra work. The rule is simple. Do not re-render what has not changed.
Use these tools to fix lag:
- React.memo: Stops components from re-rendering if props stay the same.
- useMemo: Skips expensive calculations.
- useCallback: Keeps function references stable.
- React.lazy: Splits your code so users download less.
- react-window: Renders only the items visible on screen.
Follow this workflow:
- Build clean code first.
- Measure speed with React DevTools.
- Find the bottleneck.
- Optimize the slow part.
- Measure again.
Quick wins for your app:
- Use stable IDs for keys. Do not use index.
- Add loading="lazy" to images.
- Debounce search inputs.
- Move static objects outside your component.
Do not optimize too early. Memoization adds memory cost and complexity. Measure, do not guess.
Source: https://dev.to/kushang_tailor/performance-optimization-advanced-patterns-in-react-39mj