10 Effective Ways to Improve React Performance

1. Use React.memo

React.memo prevents unnecessary re-renders by memoizing functional components. Use it for components that render the same output given identical props.

2. Avoid Inline Functions in JSX

Inline functions create a new instance on every render, causing subcomponents to re-render. Move your functions outside of render or memoize them with useCallback().

3. Use useMemo for Expensive Calculations

useMemo() caches the result of heavy computations until dependencies change, preventing re-execution on every render.

4. Code Splitting and Lazy Loading

Split your React app into smaller chunks using React.lazy() and Suspense to improve initial load times.

5. Optimize Images

• Use next/image or modern formats like WebP.
• Serve responsive sizes to avoid large downloads on mobile.
• Compress assets with TinyPNG or Squoosh.

6. Avoid Reconciliation Pitfalls

Always use stable, unique key props for lists. Incorrect or dynamic keys can force React to re-render whole lists unnecessarily.

7. Minimize Re-Renders with Context API

Context updates trigger all consumers. Limit re-renders by using selectors, memoized values, or external state managers like Zustand or Redux Toolkit.

8. Optimize State Structure

• Keep state local where possible.
• Split large objects into smaller, focused states.
• Avoid unnecessary parent re-renders.

9. Use Production Builds

Always deploy production builds of React. They are smaller and faster, with optimizations like dead code removal and minification.

10. Analyze Performance with React Profiler

The React DevTools Profiler helps identify slow components. Profile render times to locate bottlenecks and optimize accordingly.