10 React Performance Tips You Need to Know

Performance is crucial for user experience. Here are essential tips to make your React apps faster.

1. Use React.memo Wisely

Prevent unnecessary re-renders with memoization:

const ExpensiveComponent = React.memo(({ data }) => {
  return <div>{/* render data */}</div>;
});

2. Virtualize Long Lists

For lists with thousands of items, use virtualization:

import { FixedSizeList } from 'react-window';

<FixedSizeList
  height={400}
  itemCount={1000}
  itemSize={35}
>
  {Row}
</FixedSizeList>

3. Code Splitting

Split your bundle to load only what's needed:

const Dashboard = React.lazy(() => import('./Dashboard'));

4. Optimize Images

• Use next/image for automatic optimization
• Implement lazy loading
• Serve WebP format

5. Use Production Builds

Always deploy production builds with minification and tree shaking enabled.

Conclusion

Performance optimization is an ongoing process. Profile your app regularly and address bottlenecks as they appear.