Performance Optimization

Learn techniques to optimize React applications including memoization, code splitting, and lazy loading.

Memoization with React.memo

React.memo is a higher-order component that memoizes the rendered output of a component, preventing re-renders if its props have not changed.

useMemo

The useMemo hook caches the result of a calculation between re-renders. It's useful for optimizing expensive computations.

Code Splitting with React.lazy

Code-splitting is a feature supported by bundlers like Webpack and Rollup which can create multiple bundles that can be dynamically loaded at runtime. React.lazy lets you render a dynamic import as a regular component.

useCallback

The useCallback hook memoizes a callback function, preventing it from being recreated on every render. This is useful when passing callbacks to optimized child components.

Lazy Loading Routes

Lazy loading can also be applied to routes to split your application into smaller chunks, loading code only when the user navigates to a specific route.