Jacob "kurtextrem" Groß

In case you haven't heard: A faster TypeScript has dropped, written in Rust. It's faster than tsgo, by a huge margin. A faster typecheck also helps agents finish faster. It even makes your editor faster (in case you use Cursor, for example). blog.cloudflare.com/typescript-r...

Blink: Intent to Ship: Deferred imports evaluation ("import defer")

the worst part about talks is writing talks the best part about writing talks is finding all the oopsies in the code being talked about and thus, I now have PRs to make the TS AST 2% smaller, the parser 10% faster, the binder 1.5% faster

A long, long, long road, but `clip-path` animations are about to be GPU accelerated in Chromium: issues.chromium.org/issues/40503...

@jakebailey.dev On X @fabiospampinato.bsky.social found a case where tsgo is slower than TS in a specific case: x.com/i/status/207..., is that interesting for you?

Speeding up the JS ecosystem OXC edition 🚀 We made both oxfmt and oxlint 50% faster on projects with >50k directories. marvinh.dev/blog/speedin...

I started migrating the main monorepo at @framer.com to @voidzero.dev's oxlint. Speed difference is day and night. For 420 enabled rules (including typescript-eslint rules), without cache: eslint: 3m58s | 21 GB RAM oxlint: 0m46s | 4.6 GB RAM (oxlint) + 6 GB tsgo 🚀5x faster, 2x less RAM usage

Chrome will soon have a way to cache the compilation result of inline scripts (bytecode). Wow! chromestatus.com/feature/5132...

Blink: Intent to Prototype: Lazy loading for video and audio elements

How's the mobile CPU landscape evolving? Thanks to process node improvements, a mid-range Android from 2025 is (finally!) as fast as 2017's iPhone 8, but a low-end (~$100) smartphone isn't yet as speedy as a decade-old iPhone 6s.

@ricky.fm When you have multiple (unrelated) expensive components running transitions to update, how could you "flush" some transitions individually instead of batching? (apart from making each comp faster to render)

💫 When performance experts choose WebPerformance Report to simplify and share their insights, it reinforces our mission to make data more actionable for everyone. Thank you, Jacob @kurtextrem.de, for trusting WPR to bring clarity to web performance. ⚡ 👉 webperformancereport.com#Testimonials #webperf

Belated hi from @perfnow.nl! Come talk to us (me & @kurtextrem.de) about React performance, Framer sites, LCP/INP and more :D

Senior performance engineer @kurtextrem.de talks about Framer's journey to adopting Rolldown and the chunking configurations used in production. Full video in comments⏬

My first big stage & first LinkedIn live stream appearance is today, 10:55 @ ViteConf. I'll talk about how Framer integrated VoidZero's new web bundler Rolldown. Plus, some things about performance and why you should still bundle in 2025. Tune in (free): www.linkedin.com/events/73138...

ICYMI, I keep updated recommendations for low-spec testing devices here: infrequently.org/links/#hardw...

The semver library used in npm, yarn and pnpm could be made 33x faster. Ran into that while wondering why running `npm install` takes so long on the Preact repo. marvinh.dev/blog/speedin...

performance.now(), the web performance conference, 30th and 31st of October, Amsterdam. Single track, the best speakers in the industry, plenty of your performance-mad peers around to have fascinating conversations. What's not to like? Let's introduce our speakers ... perfnow.nl

⚡ Lighthouse (incorrectly) punishes preloading If you’re like me, you probably struggled with Lighthouse scores at least once. “I already optimized everything; why is my score still yellow?” Often, the cause is there’s more to optimize. But sometimes, it’s Lighthouse itself.

How To Improve INP: Yield Patterns kurtextrem.de/posts/improv... by @kurtextrem.de #WebPerf #Performance #INP

Say hello to `inverse-subset`! The idea is from a conversation with @andydavies.me at #perfnow. When you have a complete font and a subset e.g. Latin, generate another subset consisting of everything not in the original subset. E.g. all characters that are NOT Latin. npmjs.com/package/inverse-subset

is this still true, even for script type=module? 🤯 cc: @chromium.social … can’t for the life of me find the message but thank you to the person at @perfnow.bsky.social who sent this my way ❤️ web.dev/learn/perfor...

"Everyone experiences P99" - @anniesullie.bsky.social ... at subway stations, or flaky internet. Understanding & monitoring that experience can make sense. blog.chromium.org/2021/04/digg... #PerfNow

Closing talk day 2 @ #PerfNow: @anniesullie.bsky.social showing how much time improving CWVs saved. I like how Alex's great talk at the closing of day 1 was a wake-up call and now we get to see the positive side of things as contrast.

@kurtextrem.de shares thoughts on communicating performance to your boss. Thanks for the @speedcurve.bsky.social shoutouts! #performance.sync() @perfnow.bsky.social

The all new performance chapter of the 2024 Web Almanac written by Jevgenija Zigisova and @inesakrap.bsky.social almanac.httparchive.org/en/2024/perf...

I'll be speaking on the #PerfNow pre-conference meetup - performance.sync(). Topic: Collecting UX-impacting metrics your boss understands. Lightning talk, to spark thoughts!⚡ Looking forward to it: lu.ma/z1qt2a63

I joined Twitter when I was between 13-14, and now joining a new platform that is basically Twitter, but different, feels like really getting old. So far I like the feed though.