In React, performance often comes down to avoiding unnecessary re-renders. Too many re-renders can slow down your app and make it feel less responsive.<\/p>\n
Until now, below methods used\u00a0 to avoid re-renders :<\/p>\n
These tools work but they also add extra code, boilerplate, and can be misused. In fact, over-memoization can sometimes reduce performance instead of helping.<\/p>\n
React Compiler<\/strong> – it is a build\u2011time optimization tool that automatically memoizes components so it allows developers to concentrate on writing logics without worrying about manual optimization on renders.<\/p>\n The React Compiler is an experimental feature introduced alongside React 19. <\/p>\n Before the compiler, if you wanted to avoid unnecessary renders, you would write:<\/p>\n Without React.memo, this component would re\u2011render whenever its parent re\u2011renders, even if name has not changed.<\/p>\n With React Compiler enabled you can skip the wrapper:<\/p>\n During build time the compiler transforms your code into something like:<\/p>\n the compiler applies memoization only where it\u2019s safe.<\/p>\n step-by-step flow:<\/p>\n You can try it with Next.js app in experimental mode<\/p>\n next.config.js:<\/p>\n You can check optimizations by opening React DevTools Profiler \u2014 you will see less renders for unchanged props.<\/p>\n The React Compiler is a big change. Instead of developers doing all the work to optimize performance, the compiler now handles a lot of it automatically. You will still need to build your app with good structure & check performance when needed, but thanks to automatic memoization, making React apps fast has become much easier.<\/p>\n","protected":false},"excerpt":{"rendered":" In React, performance often comes down to avoiding unnecessary re-renders. Too many re-renders can slow down your app and make it feel less responsive. Until now, below methods used\u00a0 to avoid re-renders : React.memo to wrap components useMemo and useCallback to memoizing values and functions These tools work but they also add extra code, boilerplate, […]<\/p>\n","protected":false},"author":1826,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":90,"footnotes":""},"categories":[5876],"tags":[7797,7796],"class_list":["post-74192","post","type-post","status-publish","format-standard","hentry","category-js","tag-react19","tag-reactcompiler"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\tWhat is the React Compiler?<\/h2>\n
\nIt\u2019s essentially a static code analysis and transformation tool that:<\/p>\n\n
\u00a0Memoization \u2013 The Old Way<\/h2>\n
import React from 'react';\r\n\r\n\r\nconst Greeting = React.memo(function Greeting({ name }) {\r\n\r\n\u00a0\u00a0console.log('Rendered:', name);\r\n\r\n \u00a0return <h1>Hello, {name}<\/h1>;\r\n\r\n});\r\n\r\n\r\nexport default Greeting;<\/pre>\nMemoization \u2013 The Compiler Way<\/h2>\n
function Greeting({ name }) {\r\n\r\n\u00a0\u00a0console.log('Rendered:', name);\r\n\r\n \u00a0return <h1>Hello, {name}<\/h1>;\r\n\r\n}<\/pre>\nconst Greeting = React.memo(function Greeting({ name }) {\r\n\r\n\u00a0\u00a0console.log('Rendered:', name);\r\n\r\n\u00a0\u00a0return <h1>Hello, {name}!<\/h1>;\r\n\r\n});<\/pre>\nHow the React Compiler Works<\/h2>\n
\n
Benefits of Automatic Memoization<\/h2>\n
\n
Limitations<\/h2>\n
\n
How to Try React Compiler<\/h2>\n
npx create-next-app@latest my-app --experimental-app<\/pre>\n
module.exports = {\r\n\r\n\u00a0\u00a0experimental: {\r\n\r\n\u00a0\u00a0\u00a0\u00a0reactCompiler: true,\r\n\r\n\u00a0\u00a0},\r\n\r\n};<\/pre>\n