The e18e (Ecosystem Performance) project is an initiative to bring together the groups and individuals who are passionate about improving performance of the JavaScript ecosystem. Many ongoing efforts are already happening in this space, from dependency tree cleanups to performance optimizations, and much more. Our aim is to provide a space for contributions, ideas and knowledge sharing around the
I often feel like javascript code in general runs much slower than it could, simply because it’s not optimized properly. Here is a summary of common optimization techniques I’ve found useful. Note that the tradeoff for performance is often readability, so the question of when to go for performance versus readability is a question left to the reader. I’ll also note that talking about optimization n
こんにちは。フィナンシャル開発センターの鈴木です。LINE証券のフロントエンドを担当しています。この記事は【LINE証券 FrontEnd】シリーズの4番目の記事です。 最近のWeb Vitalsの隆盛を受けて、LINE証券のフロントエンドでもパフォーマンスの改善に取り組み始めました。およそ2週間ほど改善に取り組んだ結果として、開発環境での計測ではLighthouseのperformanceスコアが従来より30点ほど上昇しました。 パフォーマンス改善のためにさまざまな施策を行いましたが、この記事ではその中でも興味深かったものとして、requestIdleCallbackを活用してLazy Loadingされるコンポーネントの読み込みを遅延し、その結果初期レンダリングにかかる時間を約14%削減できた事例をご紹介します。 環境 以前の記事でご紹介したとおり、LINE証券のフロントエンドはTyp
FOSDEM 2024/Schedule/Events/Developer rooms/Web Performance/Fast JavaScript with Data-Oriented Design Let’s squeeze the last bits of performance out of JS so that we can crunch massive amounts of data! In this presentation I will describe what I learned while optimizing the Firefox Profiler. The Firefox Profiler is a web application which needs to handle large profiles containing hundreds of thous
JSer.info #679 - TypeScript 5.4 Betaがリリースされました。 Announcing TypeScript 5.4 Beta - TypeScript クロージャーにおけるNarrowing結果の改善、NoInfer Utility Typeが追加されています。 また、ES2024のObject.groupBy/Map.groupByをサポート、Import Attributesのサポートが追加されています。 そのほかには、target: "ES3"やoutオプションなどを非推奨として、次のTypeScript 5.5で削除されることがアナウンスされています。TypeScript 5.5で削除されるオプションは、次のIssueにまとめられています。 Feedback: 5.0 deprecations · Issue #51909 · microsoft/T
Jacob Groß (@kurtextrem@webperf.social, @kurtextrem) is a passionate Software Engineer who loves all topics related to webperf, UX & security. Currently Principal Software Engineer at JSMD Group, based in Munich, Germany. Server-rendered Redux apps commonly have to transfer the store state from the server to the client. Transferring large states can be slow, so in 2019, Henrik Joretag benchmarked
Stéphane Goetz (@onigoetz) is a performance enthusiast. Working on developer tooling, frontend libraries, and architecture as Principal Software Engineer at Swissquote Bank. Introduction I wish to bring you with me on a journey to learn about optimizing a library for localization, I would like to share my learnings with you on benchmarking, profiling, and optimizing. At Swissquote Bank, we use cli
Hey, I'm Fabio and I've been contracted by the Prettier team to speed up Prettier's command line interface (CLI). In this post we'll take a look at the optimizations I've discovered, the process that lead to finding them, some exciting numbers comparing the current CLI with the new one, and some guesses about what could be optimized next. Installation The new work-in-progress CLI for Prettier has
Speedometer 3 is a cross-industry effort to build a modern browser benchmark rooted in real-world user experiences. Its goal is to focus browser engineering effort towards making the Web more smooth for actual users on actual pages. This is hard to do and most browser benchmarks don’t do it well, but we see it as a unique opportunity to improve responsiveness broadly across the Web. This requires
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