Don’t let re-rendering hamstring your React app: memoize! Learn when and how to memorize to improve the performance of your React app.

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Memoization is a performance optimization technique in React that prevents unnecessary re-renders and recalculations. React provides three main tools: React.memo for memoizing components, useMemo for caching computed values, and useCallback for stabilizing function references. While these tools are powerful for optimizing expensive operations like filtering large lists or preventing child component re-renders, they add overhead and should be used judiciously. React 19's new compiler changes the landscape by automatically memoizing components and hooks at build time, making manual memoization less critical in most cases.

React Basics: Memoization in React

useMemo: Memoizing Expensive Calculations