React
React PerformanceReact Performance
React performance optimization keeps the website running smoothly.
Read Time
5 min readDifficulty
BeginnerLast Updated
Jun 15, 2026Version
v1.0.0Introduction
While React is naturally fast, a poorly written application will still feel slow and laggy. Developers use specific techniques and Hooks to prevent React from redrawing the screen when it doesn't need to.
Key Points
- Use `React.memo` to skip re-rendering unchanged components.
- Use `useMemo` to cache heavy math calculations.
- Use `useCallback` to cache functions passed to children.
- Always add unique `key` props to lists to help React update them.