"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

I've been exploring @speedcurve.com's new Vitals Overview dashboard with some customers for a week or so now, and all I can say is WOW. Not only is it fun to play with, it also halves the time it takes to investigate #webperf and #ux issues. 👉 Take a quick tour: www.speedcurve.com/blog/a-smart...

The trans partner of Tyler Robinson had no knowledge about it and was told to delete messages but didn't and instead turned them immediately over to the police and cooperated. Yet, the right is demonizing her and blame everything on trans people despite the trans person here doing the right thing.

Need help with web performance optimization? Have a tricky new build you're working on? I have two projects wrapping up and am available for new ones starting next week. sia.codes/services/

The body language alone speaks VOLUMES. #SlavaUkraine 🇺🇦

Same code, same infrastructure, different context. Web performance is sometimes an ‘us thing’ and sometimes a ‘them thing’. For better or worse, we have a responsibility to cater to both.

✨SPDY STREAM 006 ✨ Thank yous! @cliffcrocker.bsky.social @karlijnlowik.bsky.social @bluesmoon.info We had a great audience, and an even better chat around W3C RUM CG. Video will be edited shortly and shared. The original live stream was pulled down. Thank you again for joining us!

<its_happening.gif> open-web-advocacy.org/blog/japan-a...

✨ SPDY STREAM 006 ✨ 1PM EST, 5PM CET Tomorrow, I'm hosting a great session for anyone familiar OR unfamiliar with Real User Monitoring (RUM). We'll be joined by experienced RUM data, web performance professionals who will share their expertise but mainly discuss the W3C RUM Community Group. Join us!

"The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command." ~ George Orwell, 1984

Wanna measure Core Web Vitals for for SPAs? Well we've been working on the Soft Navigations API for that and we're launching a new origin trail from Chrome 139. More details here: developer.chrome.com/blog/new-sof... And the docs have also been updated: developer.chrome.com/docs/web-pla...

Great post from @cliffcrocker.bsky.social from @speedcurve.com investigating Long Animation Frames (LoAFs) and their correlation to business metrics: www.speedcurve.com/blog/long-an... Are you measuring LoAFs on your site? Helps with INP and beyond! #webperf

Great findings in this post by @cliffcrocker.bsky.social! If a #webperf metric doesn't align with user behavior or business outcomes, how useful is it? Cliff investigates the relationship between new LoAF metrics and conversion rate across four retail websites. www.speedcurve.com/blog/long-an...

Just published a new section on my site to capture references to a lot of the essential web performance and fundamentals-oriented webdev resources I find myself continually directing folks to. Also, lots and lots of links to blogs I love: infrequently.org/links/

FACT: Every industry-leading site that I know of uses performance budgets to stay fast. It's never too late to join the club.

If they think Superman is woke, wait until they learn about Jesus.

Return experience overall winner: SpeedCurve! 🏆🏆🏆 I love that Morgan not only makes a case for investing in real user monitoring for smaller sites, but also gives background for setting up the tools he tested. This is a great read for anyone who's getting started with #webperf. Thanks, Morgan!

When you write a tech book, you don't do it for 💰💰. You do it to share a topic you're passionate about. When I get a royalty for my book, I don't think "Time to go shopping!" I think "Folks want to learn about one of my favourite topics!" If you've read my book, thank you! I'd love your feedback!

I'm looking to recruit talented senior engineers that have experience related to web performance monitoring and optimization. If that sounds like you—or someone you'd highly recommend—please send me a DM and I’ll share more details! The role is 100% remote and async-first.

Ronald Reagan: “Anyone, from any corner of the Earth, can come to live in America and become an American…This, I believe, is one of the most important sources of America's greatness.”🇺🇸🇺🇸

Happy to announce the @speedcurve.com #perfhero for the month of June, Harry Roberts! @csswizardry.com I had a catch up with Harry and talked all things webperf. Have a listen! www.speedcurve.com/blog/web-per...