Optimizing React Performance: A Complete Guide

Performance is crucial for user experience. This guide covers techniques to optimize React applications.

React Performance Optimization

Use React.memo

React.memo prevents unnecessary re-renders:

const MyComponent = React.memo(({ name }: { name: string }) => {
  return <div>{name}</div>;
});

useMemo and useCallback

Use useMemo for expensive calculations:

const expensiveValue = useMemo(() => {
  return computeExpensiveValue(a, b);
}, [a, b]);

Use useCallback for function memoization:

const handleClick = useCallback(() => {
  doSomething(a, b);
}, [a, b]);

Code Splitting

Split your code to reduce initial bundle size:

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

Conclusion

Performance optimization is an ongoing process. Measure, optimize, and repeat!