There's a new #webperf measurement API in the works! Check out this post looking at the work @jason-williams.co.uk and @jdapena.bsky.social have been putting into there Container Timing—available as an origin trail from Chrome 148 (rolling out next week). developer.chrome.com/blog/contain...

Had a delightful session today. A great conversation was had w/ @jdapena.bsky.social of @igalia.com about the work being done w/ container timing in Chrome. Both @jason-williams.co.uk + @andydavies.me got mentions. 🙃 This should be published soon. Thx to all who joined in!

It feels like it's been a lifetime since I wrote content instead of code, but I'm finally back at it! I put together this March newsletter for A11y Pulse, covering what we shipped last month: www.a11ypulse.com/blog/newslet...

Okay guys they've gone behind the Moon so it's time for us to put our ape masks on This is going to be HILARIOUS

New on the Squarespace Engineering Blog! Squarespace & Web Standards: How We Helped Bring HTML Video & Audio Lazy-Loading to Today’s Browsers. I'm real proud of the teamwork that went into this. Stay tuned for part 2 next week, which will cover dev best practices for using this new HTML standard.

p75 and p90 JavaScript bytes on the web have exploded since May, 2025—easily the largest 10 month period based on HTTP Archive data since 2023. The long-tail is getting worse, very quickly. Gemini, what happened in May 2025?

Jim Acosta testified before Congress today warning that a pending merger could hand CNN to Trump-aligned billionaires. He’s never stopped speaking truth to power, even when it cost him. We’re grateful someone is still saying it out loud. Share if you believe in a free press. @jimacosta.bsky.social

Southwest Airlines Begins Assigning Chores https://theonion.com/southwest-airlines-begins-assigning-chores/

How dare her!! 🧐🤨 "When people like Kamala Harris send our sons and daughters, our young people, to fight in stupid wars, it is the young generation that carries the burden of that. We're gonna stop sending our young people to far away lands. We are not the policemen of the world."

A slow UX affects people’s perception of three important brand elements that are completely unrelated to page speed: content, design, and usability. Here's why that takeaway is relevant in an increasingly competition online landscape 👉 www.speedcurve.com/blog/brand-p... #webperf #ux #pagespeed

So excited to be paired with @paulcalvano.bsky.social for this double-header on PerformanceObserver next week! Paul will take a deep dive into the HTTP Archive. Then I'll break down the "performance plateau" – why you need to know it and how to find it. performanceobserver.dev/events/episo...

Ironic that England does No Kings better than we do

Will it be national news? Will it cause performative outrage? Will he be censured? Nope. Forgotten by tomorrow.

Shame about the lack of #webperf enhancements accepted into Interop 2026, particularly CLS which would have been really useful. But there are plenty of performance-adjacent improvements, mainly via CSS enhancements such as anchor positioning and scroll-driven animations: web.dev/blog/interop...

Country Singer, songwriter Charley Crockett well said......

Flashback to 2008 when John McCain shut down a racist line of questioning. I miss this Republican Party.

✨ SPDY STREAM 023 ✨ w/ @dbelson.com of @cloudflare.social, Head of Data and Insights. We are excited to welcome David in discussing the recently released @radar.cloudflare.com 2025 Year in Review! Join us! ✨ SPDY STREAM 023 ✨ 📆 Wed Feb 4th 2026 ⏰ 1pm EST, 10am PST 🔗 www.youtube.com/live/R-j3HrE...

Hi friends. Are you finding that suddenly armed gangs are roving your street deploying chemical weapons like it's candy at a parade? You can go to Menards or a hardware store and get the 3M chemical respirators. They are in the paint section. Smalls exist but they need to be ordered. Stay safe!

Ladies and gentlemen, the greatest American songwriter that no one remembers, Blaze Foley. Give him two minutes and he might change your life.

For anyone wanting to support the people under attack in St. Paul here's a fundraiser being organized by people in the public schools to help directly with rent relief. This is a huge need, please share widely! ❤️‍🔥 my.cheddarup.com/c/support-ou...

"Websites that work perfectly in traditional browsers may end up broken for actual accessibility tools. The web will fragment as sites must test against a growing number of AI browser agents with different requirements." www.coryd.dev/posts/2025/a...

This one got released rather quietly and I think could do with a bit more attention! Read about how to avoid caching performance penalties due to tracking query params and the like!

Web Performance Calendar day 15 with @nicj.net, @cliffcrocker.bsky.social and @karlijnlowik.bsky.social Löwik presenting an update on W3's RUM Community Group and YOU calendar.perfplanet.com/2025/rumcg-a...

LCP and INP are now Baseline newly available /since they are now available in all major browsers! 🎉🥳🍾 Really, really, really curious to see what sort of new performance insights we’ll see as sites start to collect and look at the data! #CoreWebVitals

Since it was mentioned by @cliffcrocker.bsky.social on the @embrace.io x @speedcurve.com webinar: A reminder that Mike K of @cloudflare.social is my guest tomorrow to talk about TELESCOPE. Really excited for this one. Join us! 📆 Wed Dec 10th ⏰ 2pm EST 🔗 www.youtube.com/live/hhNFI_X...

Really excited for this. Telescope is so hot right now.

I’ve been seeing a lot of AI talks and articles lately - I have no idea what’s going on but it has got me wondering about Performance and accessibility and I only have more questions. “People deserved a better web. Will AI be the one who gets it?” medium.com/@mandy.micha...

#PixelPalooza is coming up this Thursday! This awesome FREE online event covers how to make sure all those helpful images and videos on your site don't hurt #webperf and #a11y. I'm joining @seancdavis.com to talk about the hidden cost of media on the web. Get your ticket 👉 cfe.dev/events/pixel...

They say AI will replace the web as we know it, and this time they mean it. Here follows a short list of previous times they also meant it,… https://zeldman.com/2025/10/25/receipts-a-brief-list-of-prominent-articles-proclaiming-the-death-of-the-web/?utm_source=bluesky&utm_medium=jetpack_social

6 years ago I started a side project to build a web accessibility tool that prioritises simple reporting and quick feedback loops so that teams can fix a11y regressions before they affect users. I am so proud to say that side project is now finished, and A11y Pulse is live. www.a11ypulse.com

Curious about web technology coming to Safari? How about field-sizing, position-visibility, random(), scrollbar-color, hidden=until-found, auto-expanding <details>, command & commandfor, Largest Contentful Paint, CHIPS, scrollend event, Navigation API & more! developer.apple.com/documentatio...

Seeing everyone this week at #perfnow was a gift. So many great humans focused on an important cause. Can’t wait for next year!

Always, always happy to see @yoav.ws get a shout-out. So much incredible work has happened because of him. Most recent example—speculation rules in WebKit. #perfnow

@mmocny.com doing an excellent job of visually explaining how interactions are measured between an MPA and a SPA. #perfnow

Huge thanks to @andydavies.me for mentioning the LoAF Helpers WebPerf Snippet at @perfnow.nl! Honored to be part of the amazing Web Performance community 🫶 🔗 webperf-snippets.nucliweb.net/Interaction/... #WebPerf #PerfNow #Performance #LoAF #INP #CoreWebVitals

So fortunate to work with this guy. Hard-pressed to find anyone with more knowledge on LoAF than @andydavies.me. That shirt though… #perfnow

@tkadlec.bsky.social is not only an ambassador of user experience he’s also the king of bad dad jokes. #perfnow #perfdad

Good morning and happy Halloween, #PerfNow friends! So excited about Day 2! If you’d like to chat about #webperf and #ux, come chat with @andydavies.me and @cliffcrocker.bsky.social and me from Team @speedcurve.com. And I still have plenty of Halloween goodies! Trick or treat!

Google's performance thresholds are not your thresholds. Remember that Core Web Vitals are certainly a good starting point, but not the end goal. Don't aim for somebody else's target, correlate with your own real user conversions and set your own goals. @tammyeverts.com #PerfNow #webperf

Loving the creativity @inesakrap.bsky.social is bringing to her talk on building a sustainable, fast web. #perfnow

“As performance-minded technologists, you are in a position to do something about accessibility.” — @marcysutton.com at #PerfNow marcysutton.com/accessibilit...

And last (but definitely not least) here’s @cliffcrocker.bsky.social’s super-interesting analysis of INP and its correlation with UX and business metrics. #PerfNow www.speedcurve.com/blog/INP-use...

@tammyeverts.com kicking off @perfnow.nl with a focus on what really matters. Users.

Great start to my favorite week with our first in person #RUMCG meeting before @perfnow.nl What’s RUMCG? www.w3.org/community/ru...

Trump Touts Productive Call With Putin About Ballroom Sconces https://theonion.com/trump-touts-productive-call-with-putin-about-ballroom-sconces/

So they didn’t like the ad. Let’s just post Reagan’s 5 min speech against tariffs as it appears on YouTube. Over and over. On all platforms (some of y’all are still on X). *1981 Sherrilyn horrified by 2025 Sherrilyn saying “let’s post Reagan’s speech.” youtu.be/5t5QK03KXPc

Over the past week, the president said the DOJ should pay him a quarter billion dollars, bulldozed half the White House to build himself a gaudy ballroom, bragged about murdering civilians in international waters, pardoned some more criminals, directed federal prosecutors to indict his opponents ...

We've already had a great response to this. Thank you everyone who took the time to make a ranking - I know there's a lot of proposals. If you haven't, there's still time! bsky.app/profile/fire...

Safari TP 230 includes support for Largest Contentful Paint 🙌 #webperf

OK, we're down to our last tickets. There's still room for people to join performance.now() on 30th and 31st of October (in two weeks and a bit), but it's time to decide. perfnow.nl Last tickets at perfnow-2025.eventstack.shop