GraphQL Ruby benchmarkGraphQL Tokyo #18 発表資料 https://www.meetup.com/ja-JP/graphql-tokyo/events/286913987/
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
結局useMemoはいつ使えばいいの？ 僕の決定版 - Qiita
皆さんこんにちは。筆者の以前の記事では、ReactのuseMemoを無駄に使うことによるレンダリング速度のオーバーヘッドがどれくらいかをベンチマークによって示しました。 それによれば、スマートフォンを想定したとしても、useMemoだけで描画に目に見える影響を与える（16msくらいの遅延を発生させる）には万のオーダーのuseMemoが必要なことが分かります。 この結果が出たことでuseMemoをいつ使うのかなどという議論には終止符が打たれたかと思いきや、上記の記事の感想などを見ているとまだ喧々囂々です。 そこで、この記事では筆者の考えを皆さんに共有し、いよいよもってこの議論を終わりにしたいと思います。 結論は、今いる関数の外を見に行くな。そのuseMemoが今または将来に役に立つ可能性が1%でもあるなら使えです。 前提知識 useMemoというのは結局レンダリングパフォーマンスの最適化のた
そこのお前！ 余計なuseMemo1個に含まれるオーバーヘッドは余計なdiv 0.57個分だぜ！ - Qiita
※効果には個人差があります。 useMemoのオーバーヘッドについて ReactのuseMemoは、パフォーマンス最適化に使われるAPIです。コンポーネント内で計算やオブジェクトの生成を行う際に、以前の計算結果をキャッシュして使い回すことで再レンダリング時の計算を削減したり、新しいオブジェクトの生成を防ぐことができます。 useMemoに関しては、あくまで最適化のためのものであるから「無駄に使うべきではない」という言説がよく見られます。その理由は、useMemoのコストもゼロではなく、余計な使用はそれだけパフォーマンスの低下に繋がってしまうからです。 しかし、筆者はuseMemoのコストは微々たるものであり、本当に一目見て明らかに無駄でない限りは積極的に使うべきだと思っています。 そこで、筆者はuseMemoのオーバーヘッドがどれくらいかを調べるためのベンチマークを作成しました。この記事で
React Query のレンダリング最適化を目指した話 - Techtouch Developers Blog
エンジニアの macchii です。この記事はテックタッチアドベントカレンダー 14 日目の記事です。 テックタッチでは React を利用して WEB フロントエンドを開発しています。あわせて、リモートデータの取得、更新、キャッシングには React Query を導入しています。本記事では、簡単なタスク管理アプリを題材に、「React Query の再レンダリングを最適化するテクニック」紹介します。 ja.reactjs.org react-query.tanstack.com TL;DR はじめに React Query は取得データを厳密に比較（deep compare）する 参照していないプロパティの変更でも再レンダリングが発生する notifyOnChangeProps オプション select オプション まとめ TL;DR React Query は取得データを厳密に比較（
Next.js 11
As we announced at Next.js Conf, our mission to create the best developer experience continues with Next.js 11, featuring: Conformance: A system that provides carefully crafted solutions to support optimal UX. Improved Performance: Further optimizations to improve cold startup time so you can start coding faster. next/script: Automatically prioritize loading of third-party scripts to improve perfo
Real-world CSS vs. CSS-in-JS performance comparison
CSS-in-JS has taken a solid place in front-end tooling, and it seems this trend will continue in the near future. Especially in the React world. For example, out of 11492 people who participate in State of CSS survey in 2020 only 14.3% didn’t hear of Styled Components (a dominant CSS-in-JS library). And more than 40% of participants have used the library. I wanted to see an in-depth performance co
React Server Components with Next.js - Vercel
React Server Components allow developers to build applications that span the server and client, combining the rich interactivity of client-side apps with the improved performance of traditional server rendering. In the upcoming Next.js major release, React developers will be able to use Server Components inside the app directory as part of the changes outlined by the Layouts RFC. This post will ex
Flutter vs React Native vs Native: Deep Performance Comparison | inVerita
Flutter vs React Native vs Native: Deep Performance Comparison The Story Behind the Research As a custom software development company, inVerita and its mobile development team continuously dig into the performance of cross-platform mobile solutions available on the market, that’s how Flutter vs React Native vs Native Part I emerged. Yes, it was quite controversial as one can state we weren’t using
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's diff algorithm
Christopher Chedeau (@vjeux) is a Facebook Software Engineer in the Photos Team. Before that, he went to EPITA, a 5-year Computer Science school and majored in its R&D lab LRDE. He also worked for Curse during the nights and week-ends. React is a JavaScript library for building user interfaces developed by Facebook. It has been designed from the ground up with performance in mind. In this article
Performance metrics for blazingly fast web apps
Get inspiration on productivity, design, and technology. At Superhuman, we're building the fastest email experience in the world. Get through your inbox twice as fast as before, and sustain inbox zero! As the saying goes: "If you can't measure it, you can't improve it." We therefore spend a lot of time measuring speed. And as it turns out, performance metrics are surprisingly challenging to get ri
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
Use React.memo() wisely
Users enjoy fast and responsive user interfaces (UI). A UI response delay of fewer than 100 milliseconds feels instant to the user. But a delay between 100 and 300 milliseconds is already perceptible. To improve user interface performance, React offers a higher-order component React.memo(). When React.memo() wraps a component, React memoizes the rendered output of the wrapped component and then sk
Virtual DOM is pure overhead
If you’ve used JavaScript frameworks in the last few years, you’ve probably heard the phrase ‘the virtual DOM is fast’, often said to mean that it’s faster than the real DOM. It’s a surprisingly resilient meme — for example people have asked how Svelte can be fast when it doesn’t use a virtual DOM. It’s time to take a closer look. What is the virtual DOM?In many frameworks, you build an app by cre
Microsoft launches React Native for Windows | TechCrunch
Microsoft today announced a new open-source project for React Native developers who want to target Windows. “React Native for Windows,” as the project is unsurprisingly called, is meant to be a new ‘performance-oriented’ implementation of React for Windows under the MIT License. Being able to target Windows using React Native, a framework for cross-platform development that came out of Facebook, i
Progressive React
Performance advocates, like myself, spend a lot of time “advocating” for faster sites. At times however, we don’t cover framework-specific optimizations that can be important to consider if you use a particular framework for your site. This article will cover a number of performance optimizations you can add to your React sites. The key idea here is to ensure your site performs well enough so that
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GitHub - Shopify/react-native-skia: High-performance React Native Graphics using Skia
より速い WEB を目指す Next.js / nextjs-make-the-web-faster
GitHub - natemoo-re/microsite: Do more with less JavaScript. Microsite is a smarter, performance-obsessed static site generator powered by Preact and Snowpack.
