TF | How to optimize a React application performance

Requirements

React.js (16.8 or newer)

React.memo

Use the higher-order component to wrap functional components that do not need to re-render when their props do not change. This can help avoid unnecessary re-renders and improve performance. For example:

import { memo } from 'react';

const MyFunctionalComponent = memo(({ data }) => {
  // component implementation goes here
});

useMemo

Use the hook to memoize expensive calculations that do not need to be recomputed on every render. For example:

import { useMemo } from 'react';

function MyComponent({ data }) {
  const processedData = useMemo(() => {
    // perform expensive calculation on `data` here
    return processedData;
  }, [data]);

  // use `processedData` in component render
}

shouldComponentUpdate

Use the lifecycle method in class-based components to optimize re-renders by controlling when the component should and should not update. For example:

import { PureComponent } from 'react';

class MyComponent extends PureComponent {
  shouldComponentUpdate(nextProps) {
    // return `true` if the component should update, `false` otherwise
    return this.props.data !== nextProps.data;
  }

  render() {
    // component render logic goes here
  }
}

useCallback

Use the hook to avoid creating new function references on every render. This can be especially useful when passing props to deeply nested components that may cause a re-render when the prop changes. For example:

import { useCallback } from 'react';

function MyComponent({ onClick }) {
  const handleClick = useCallback(() => {
    // function implementation goes here
  }, []);

  return <DeeplyNestedComponent onClick={handleClick} />;
}

TLDR

To optimize a React application, you can use techniques such as memoization, , and avoiding the creation of new function references on every render. You can also use the higher-order component and the and hooks to optimize functional components and avoid unnecessary re-renders.

How to optimize a React application performance