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Top 10 Techniques For React Performance Optimization in 2022

Top 10 Techniques For React Performance Optimization in 2022

Optimization is an aspect that every software developer analyses to implement the user interface while building mobile and web applications. Plenty of JavaScript, like React, Angular, etc., implement specific features, codes, and configurations that assess the application’s optimization capability.

The React application has rapid UI features; specific performance issues are still encountered with the growth and development. Such problems cause around a 7 percent reduction in conversion rates and ROI.

The React apps include the major issue with reusing the code for massive codebases and repositories. Current evolving technologies and techniques update the UI interface and minimize the usage of costly DOM. App development companies hire React developers who implement the latest technologies to reduce the issues and upgrade the React performance.

In this article, we will discuss some elevating techniques which improve the React codes and thus the performance.

1. Use Immutable Data Structures

It is a creative method to frame the opinionated coding in the functional React apps. It does not connect to the application’s design or architecture. However, it determines the workflow of the application.

It is created with a unique opinion to determine the react application’s direction and data flow. Currently, many app developers are using immutable data for functional programming in the front-end development of the app. The essential benefits of immutable data are simplified creation, tracking variation, and testing. It has no disadvantages and also prevents temporal coupling.

2. Use Of React.Pure And Functionless Components

The React. Pure and function components optimize the React apps in two distinct methods. Function components protect the constructing class according to the bundle size. The function components are converted into pure components for UI update optimization and with an advanced customized approach.

3. Use Of Production Mode Flag In Webpack

While using the webpack as a module bundler, a specialized setting for production mode built a strong set-up for optimization.

module.exports = {
      mode: 'production'
    };

The CLI argument “webpack –mode=production” will limit the optimization and exposure to code development and libraries. In this method, the source code and file path remain safe and secure during optimization.

4. Using React.Fragment To Ignore HTML Element Wrapper

The React.fragment is used to list the fragment preventing the use of extra nodes. Below are the coding details:

class Posts extends React.PureComponent{
    render() {
        return (
            <React.Fragment>
                <h1>Post Title</h1>
                <p>posts</p>
                <p>post time</p>
            </React.Fragment>
        );
    } 
  }

Another coding to use React.Fragment with concise taxes. The codes for this are:

class Posts extends React.PureComponent{
    render() {
        return (
            <>
                <h1>Post Title</h1>
                <p>posts</p>
                <p>post time</p>
            </>
        );
    } 
  }

5. Multi-Use Of Chunk Files

Any react application has certain components with specific dependencies for features and functions. You can separate the files through vendors or multiple outsourcing codes and libraries. For example, commonChunkPlugins are available with codes vendor.bundle.js and app.bundle.js, which separate the files with browser caches and parallel downloading resources.

6. Prevent Using Render Functions With Inline Functions

In the Javascript function, the prop diff is failed when React analyses the diff assessment during an inline function. Therefore, an arrow function creates a new function in rendering files using the JSX interface. The following code makes this function:

export class PostList extends React.Component { //export included
    state = { posts: [],
      selectedPostId: null
  }
  
  render(){
      const { posts } = this.state;
      return (
         posts.map((post)=>{
             return <Post onClick={(e)=>{
                  this.setState({selectedPostId:post.postId})
             }} post={post} key={post.id}/>
         }) 
      )
  }
  }

An arrow code or function describes the inline function for prop management. It functions according to the below codes:

export default class PostList extends React.Component {
    state = {
        posts: [],
        selectedPostId: null
    }
  
    onPostClick = (postId)=>{
        this.setState({selectedPostId:postId})
    }
  
    render(){
        const { posts } = this.state;
        return (  
           posts.map((post)=>{
               return <Post onClick={this.onPostClick} 
                post={post} key={post.id}/>
           }) 
        )
    }
  }

7. Throttling And Debouncing In Javascript

This method is used to analyze the React app optimization. Here throttling refers to delaying the function and execution of the application. It executes the function for milliseconds while the React application triggers the event. Debouncing refers to preventing the event from the beginning with specified coding and minimizing debounced functions.

8. Skip Using An Index For Mapping

Using the index as a key to map the functioning of the React app. The use of keys in index form can represent incorrect information.

9. Use The Usecallback Hook

The hook uses a callback to refine the increment count when the array of dependencies changes. Below is the code:

const incrementCount = React.useCallback(() => setCount(count + 1), [count]);

10. Usage Of useMemo Code:

While the prop is passed in an array, the hook of useMemo memorizes the valuation among the renders. Below is the code to implement useMemo for marked improvement in React application.

import React, { useState } from "react";
 
const testFunction = (count) => {
// artificial delay (expensive computation)
  for (let i = 0; i < 1000000000; i++) {}
  return count * 3;
};
 
export default function App() {
  // ...
  const myCount = useMemo(()=>testFunction(count),[count]);
  return (
    <div>
 {/* ... */}
     	 <h3>Count x 3: {myCount}</h3>
      	<hr />
      	<ChildComponent count={count} onClick={incrementCount} />
    </div>
  );
}
const ChildComponent = React.memo(function ChildComponent({ count, onClick }) {
  // ...
});

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Conclusion

These are the details to optimize and improve the performance of React applications. The primary aspect of enhancing the performance has related to the issues for the application to rectify for the core.

There is specific coding with which the optimization process is different for different projects. The app development company that hire React developers assesses the core issues and implements special codes and methods for optimization and rectification, eventually improving the app’s performance.

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