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

#PerfNow has incredibly interesting talks. Anyone who's serious about performance should join. Proud that we at @framer.com are sponsors.

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⏬

⚛️ReactConf once again mentioned concurrent stores. What if I tell you, we have concurrent external stores today? (kinda) My latest blog post explains: 👉 How to to pair `useSyncExternalStore` with `useDeferredValue` (and `useMemo`) ⚡ Why this can improve UX & INP during hydration

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...

PSA: There's an open bug in React 19.1 that emits a `<link rel="preload">` for every single `<img>` tag on a page when you SSR: github.com/facebook/rea.... This can result in *tons* of preloads that are bad for LCP and also wastes network bandwidth/data.

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

Chrome 136+ ships a new V8 version that supports a "compile hint", which makes V8 parse and compile all functions in that file eagerly. Great for entry points – where you know all functions will very likely be used. Less so as 'one weird trick to make all your JS faster'.

Did you know that jQuery outperforms React, what? 😳 Sounds like clickbait, but is reality. The HTTP Archive shows 82% of sites that use jQuery have good INP on mobile📱, while only 67% do when they use React⚛️. Not just sites, also libraries. Let's fix that👇#webperf kurtextrem.de/posts/improv...

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.