React Programming Tutorials, Guides & Best Practices

React re-renders components when there's a change in state or props. While this ensures the UI stays in sync with data, it can also lead to redundant renders, especially in large component trees. Identifying and mitigating these unnecessary re-renders is key to optimizing performance.([GeeksforGeeks][2])

React.memo is a higher-order component that prevents functional components from re-rendering if their props haven't changed. It performs a shallow comparison of props and reuses the previous render result when possible.([JavaScript in Plain English][3])

This approach drastically reduces the number of rendered DOM nodes, improving performance when dealing with large datasets.

• Avoid unnecessary re-renders: Use React.memo, useMemo, and useCallback to prevent components from re-rendering unnecessarily.
• Use Lazy Loading: Defer loading of components and assets until they are actually needed to improve the initial load time.
• Optimize Large Lists: Use windowing techniques to render only the visible portion of large lists, reducing the rendering workload.
• Profile and Measure: Use React's built-in profiling tools to identify performance bottlenecks and optimize where needed.