Advanced React in the Wild
Advanced React in the WildProduction Case Studies from Ambitious Web Projects (2022–2025) Introduction React and Next.js have powered some of the web’s most ambitious projects in the last few years. In this period, teams have pushed the envelope on performance (achieving dramatic gains in Core Web Vitals like LCP and the new INP metric), balanced server-side and client-side rendering trade-offs, d
How To Improve INP: Yield Patterns
In the following, we’ll go over different patterns we can use to yield to the main thread to improve the Interaction-to-Next-Paint (INP). Knowing how to improve INP is more important than ever, as it’s a metric reflecting User Experience (UX) and has recently been added to the Core Web Vitals (CWVs) – which are used by Google’s search ranking. We’ll take a look at which part of INP we’re targettin
React Scan
React Scan automatically detects performance issues in your React app Previously, existing tools required lots of code change, lacked simple visual cues, and didn't have a simple, portable API Instead, React Scan:Requires no code changesHighlights exactly the components you need to optimizeAvailable via script tag, npm, you name it!
Million Lint is in public beta | Million.js
Million Lint is in public betaAiden Bai (opens in a new tab), John Yang (opens in a new tab), Nisarg Patel (opens in a new tab) – February 29, 2024 It’s launch time. After three months and hundreds of commits, we invite you to try out Million Lint. The experience is not finished – there are a few known bugs and several missing features – but we are really happy with how it's shaping up and couldn'
Why React Re-Renders • Josh W. Comeau
Filed underReactoninAugust 16th, 2022.Aug 2022.Last updatedoninMay 9th, 2025.May 2025. IntroductionSo, I'll be honest. I had been working professionally with React for years without really understanding how React's re-rendering process worked. 😅 I think this is true for lots of React developers. We understand enough to get by, but if you ask a group of React developers a question like “What trigg
500ms to 1.7ms In React: A Journey And A Checklist
Written by Oren Farhi, Front End Engineer Tech Lead, follow me on This article has been translated: Chinese 1 (by Qlly) Chinese 2 (by Qlly) Korean (by Ykss) I bet the need to tweak perfomance comes in a certain phase of development for every developer, in every app. There are very good resources and articles about how to tweak performance in react and this article is no exception. I thought I will
Angular without SSR is faster than Next.js with SSR. I have the data.
"If we really want to make our website faster, we should just rewrite it in Next.js." I think you'd be hard pressed to find a tech startup anywhere without at least one developer who is constantly saying this. But is it actually true? I certainly had no reason to doubt it. As someone who had just done the big upgrade from AngularJS to Angular, I was happy that all those months of work had resulted
Zhenghao's site
Published on 18 March, 2022Last updated on 17 April, 2022 This post has been translated into Korean This post is my version of Mark Erikson's essay A (Mostly) Complete Guide to React Rendering Behavior where I try to answer one of the most commonly asked questions in this React community – "when or why does React render my component?" – with a tiny amount of React source code walkthrough. Normally
The definitive guide to profiling React applications
Knowing how to profile a React application to improve real-world performance is a good tool in any front-end developer’s toolkit. The Profiler API allows us to do just that with insights on why and how long our components are rendering for. We can use the profiling data to find unnecessary and expensive renders that may be impacting performance negatively. Thankfully, it’s not that complicated. Le
Optimize React Apps PageSpeed Insights Score - thetuteur
What we will be working onWe will be working on optimizing the website of the company I work for coatconnect.com. PageSpeed Insights is a very powerful tool by Google. It allows us to analyze our website’s performance and figure out ways we can improve it. The problem with SPAs (Single-Page Applications) is that they show content after loading JavaScript chunks first, so it takes a little while on
Code-splitting and minimal edge latency: the perfect match | Fastly
Fastly Fiddle, our code playground tool, is a React single-page app that uses the excellent Monaco IDE component that powers VS Code. Problem is, Monaco is huge. And most uses of Fiddle are read only. Do we really need to load a whole IDE to display some non-editable code? No! Is lazy loading code that's cached at the edge really fast? Yes! Can I stop asking rhetorical questions and tell you how t
Improving Redux state transfer performance with JSON.parse(), a quick case study
TLDR: Turning Redux state into a JavaScript string you can parse with JSON.parse() instead of an object literal, or inert script tag, appears to be significantly faster than other approaches for sending Redux store state to the browser. For my case making this one change shaved TTI (Time To Interactive) from an already pretty good 4.04s to 3.3s, a .74s or ~18% improvement. It increased the Lightho
Rebuilding our tech stack for the new Facebook.com
Facebook.com launched in 2004 as a simple, server-rendered PHP website. Over time, we’ve added layer upon layer of new technology to deliver more interactive features. Each of these new features and technologies incrementally slowed the site down and made it harder to maintain. This made it harder to introduce new experiences. Features like dark mode and saving your place in News Feed had no strai
Profiling React.js Performance
April 8, 2020 Today, we’ll look at measuring React component render performance with the React Profiler API, measuring interactions with React’s new experimental Interaction Tracing API and measuring custom metrics using the User Timing API. For demonstration purposes, we’ll be using a Movie queueing app. The React Profiler API The React Profiler API measures renders and the cost of rendering to h
React.memo を使ったパフォーマンス最適化について - 30歳からのプログラミング
パフォーマンス・チューニングには、「こうすれば必ず上手くいく」という方法論や銀の弾丸はなく、地道に試行と計測を繰り返すしかない。 しかしだからこそ、基本的な考え方や仕組みを理解することが大切であり、それがなければ、どのように対処していけばいいのか見当をつけることすら出来ず、的外れな対応をすることにもなりかねない。 React.memoを使った処理の最適化は、React アプリのパフォーマンス改善のための、基本となるテクニックのひとつである。 この記事のコードは React のv16.10.2で動作確認している。 メモ化という概念 React アプリのパフォーマンス最適化を理解するためにはまず、メモ化（Memoization）という概念を把握しておく必要がある。 大雑把に言ってしまうとメモ化とは、何らかの計算によって得られた値を記録しておき、その値が再度必要になったときに、再計算することなく
The story of a V8 performance cliff in React · V8
Show navigation Previously, we discussed how JavaScript engines optimize object and array access through the use of Shapes and Inline Caches, and we’ve explored how engines speed up prototype property access in particular. This article describes how V8 chooses optimal in-memory representations for various JavaScript values, and how that impacts the shape machinery — all of which helps explain a re
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Release v26.0 Reactime · open-source-labs/Reactime
20x Faster dbt Docs with React Server Components
GitHub - preactjs/signals: Manage state with style in every framework
GitHub - welldone-software/why-did-you-render: why-did-you-render by Welldone Software monkey patches React to notify you about potentially avoidable re-renders. (Works with React Native as well.)
