Why Performance Matters

React application performance directly impacts user experience and business metrics. Slow applications lead to higher bounce rates and lower user engagement.

Performance Optimization Techniques

1. React.memo for Component Memoization

Prevent unnecessary re-renders by wrapping components with React.memo:

const ExpensiveComponent = React.memo(({ data }) => {
  return <div>{data.map(item => <Item key={item.id} {...item} />)}</div>;
});

2. useMemo and useCallback

Optimize expensive calculations and function references:

const expensiveValue = useMemo(() => computeExpensiveValue(props), [props]);
const memoizedCallback = useCallback(() => doSomething(a, b), [a, b]);

3. Code Splitting with React.lazy

Implement lazy loading for route-based code splitting:

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

Bundle Analysis

Use tools like webpack-bundle-analyzer to identify large dependencies and optimize your bundle size.

Monitoring Performance

Implement performance monitoring using React DevTools Profiler and browser performance APIs.