10 Common React Performance Issues and How to Fix Them (2024)

React has become one of the most popular JavaScript libraries for building user interfaces. It is known for its simplicity, flexibility, and powerful features. However, like any other technology, React has its own set of performance issues that can impact the user experience. In this article, we will discuss ten common React performance issues and how to fix them.

Rendering Unnecessary Components

One of the most common performance issues in React is rendering unnecessary components. This happens when a component re-renders even though its props and state have not changed. This can be caused by a few reasons, such as using a PureComponent incorrectly or not using shouldComponentUpdate.

To fix this issue, you should use React.memo or shouldComponentUpdate to prevent unnecessary re-renders. React.memo is a higher-order component that memoizes the component and only re-renders it when its props have changed. shouldComponentUpdate is a lifecycle method that allows you to determine whether the component should update or not.

Example:

import React, { memo } from 'react';
const MyComponent = memo((props) => {
 return…