15 Things You Can Do to Optimize React Performance

Performance optimization in React is crucial for creating fast, responsive applications, especially as the app grows in complexity. Here are several best practices and strategies to optimize React performance:

1. Use React.memo for Component Memoization

React re-renders components whenever their parent component updates, even if the props haven’t changed. React.memo prevents unnecessary re-renders by memoizing functional components.

Usage:

const MyComponent = React.memo(({ value }) => {
  console.log('Rendered');
  return <div>{value}</div>;
});

This ensures the component only re-renders when its value prop changes.

2. Use the useCallback Hook for Memoizing Functions

Passing a new function reference as a prop can cause child components to re-render. Use useCallback to memoize functions and avoid unnecessary re-renders.

Usage:

const Parent = () => {
  const handleClick = useCallback(() => {
    console.log('Button clicked');
  }, []);
  return <Child onClick={handleClick} />;
};

3. Use the useMemo Hook for Expensive Calculations