React Performance Optimization Tips

Building fast React applications requires understanding how React renders and updates components. Here are some proven optimization techniques.

Use React.memo Wisely

React.memo prevents unnecessary re-renders for functional components:

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

Virtual Lists for Large Data

When rendering large lists, use virtualization:

import { FixedSizeList } from "react-window";

const VirtualList = ({ items }) => (
  <FixedSizeList height={400} itemCount={items.length} itemSize={50}>
    {({ index, style }) => <div style={style}>{items[index]}</div>}
  </FixedSizeList>
);

Code Splitting

Split your code to load only what’s needed:

const LazyComponent = React.lazy(() => import("./HeavyComponent"));

Conclusion

Performance optimization is an ongoing process. Profile your application regularly and optimize based on real measurements.