I2S: Layout Instability API switches to CSS pixel attribution in Chrome 145. CLS scores stay the same, but attribution rectangles change, check CLS tools visualizing shifting boxes. developer.chrome.com/blog/chrome-... groups.google.com/a/chromium.o... @intenttoship.dev @googlechrome.bsky.social

Lo mejor de celebrar la llegada de un año nuevo es hacerlo siempre con #CachitosNochevieja 🥳🎆🥂

Happy New Year everyone (CET edition)!!!

Lots of great stuff in this year's Perf Planet Advent/December series: calendar.perfplanet.com/2025/

Just in time for the Christmas break! 😂

A few weeks ago, I was... "What an amazing opportunity! Let's go to Zurich for the last SCL of the year! I'll only be there for 36 hours, but YOLO!” Also me when the alarm sounds at 4:30AM and my toddler didn't fall asleep until midnight: "Why am I doing this?"

Looking for web-themed t-shirts and accessories? I just launched a small store (mostly so I can wear my own designs 😄). But sharing is caring, so feel free to check it out! And if something catches your eye, don’t miss the 3×2 Black Friday offer! planetaberilis.com

Looking for web-themed t-shirts and accessories? I just launched a small store (mostly so I can wear my own designs 😄). But sharing is caring, so feel free to check it out! And if something catches your eye, don’t miss the 3×2 Black Friday offer! planetaberilis.com

What fun! Thanks @guaca.bsky.social and @sia.codes for putting this together, to everyone that joined live, and @mattzeunert.com for sharing the stage! My deck is here: docs.google.com/presentation... And the video should be available soon at: www.youtube.com/@Performance...

I'm speaking at the PerformanceObserver online meetup tonight! Learn about performance testing, netlog data, credentialed requests, tight mode, HTTP priorities, and more! performanceobserver.dev/events/episo...

On today’s lightning-fast trip, I’m rolling with my brand-new backpack. Look closely and you’ll spot that the design is based on eleventy.config.js from 11ty/eleventy-base-blog by @11ty.dev I know, I know! I basically own the coolest backpack on the planet 💅

🚨 PerformanceObserver Episode 8 is next week on Nov 19 🚨 Come join us live for access to Q&A and general chat! In this episode, @aarontgrogg.bsky.social will explain how to reduce JS Workload with No or Lo JS. (🧵 1/2)

Ya os corrijo yo el titular, @elpais.com: Muere James Watson, quien construyó su fama (y su Nobel) sobre el trabajo de Rosalind Franklin que nunca reconoció. De nada.

Did I just purchase a $100 phone? Absolutely! to see how badly many websites perform in the wild. If your site is only fast on a flagship device, you're excluding millions of users. Stop designing for luxury! Emulators lie, low-cost hardware shows the truth.

✨ It’s that time of year! The State of JavaScript 2025 survey is currently running. 😄 I take the survey every year. It’s a great way to keep up with all of the new features and APIs that have come to browsers in the past year. stateofjs.com/en-US

performance.now() 2026 will take place on 19th and 20th of November 2026. #perfnow.

Here you go! My first perf now as a speaker… it’s was amazing 🤩 docs.google.com/presentation...

Fellow #perfnow fellows, a reminder that PerfPlanet calendar is coming this December for another edition. And it needs YOU. Please ask if you have any contribution ideas or concerns calendar.perfplanet.com/contribute/

Making Sense of Long Animation Frames… The slides from my #PerfNow talk are available on Notist noti.st/andydavies/9...

Here are mine: speakerdeck.com/ethangardner...

For those who just watched @tunetheweb.com 's presentation, this is the SPDY STREAM he just posted about w/ @yoav.ws + @krzksz.bsky.social of Shopify. Thank again Barry! #perfNow 🎥 youtu.be/DHgoULxvuJ8

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

One of my favourite pictures from 2023 #perfnow @tunetheweb.com @andydavies.me

Loving @ethangardner.com’s talk about making #webperf allies! Totally agree that competitive benchmarking can get marketing folks excited about performance Fun fact: you can do that with @speedcurve.com! #PerfNow support.speedcurve.com/docs/competi...

TIL #perfnow

Stuart on duty! #perfnow

Here’s the study from Contentsquare, in which they analyzed Interaction to Next Paint for 997 retail sites. #PerfNow contentsquare.com/blog/interac...

Slides from my @perfnow.nl talk — How Fast Is Fast Enough? — are up! If you’re at #PerfNow (or even if you’re not) I’d love to talk about creating a delightful experience for your users. speakerdeck.com/tammyeverts/...

Day 1! First talk by @tammyeverts.com. How fast is fast enough? #perfnow

New case study on wpostats.com Relive improved LCP by 50% and cut out layout shifts and saw a 3% increase in conversion rate, 6% decrease in bounce rate and 9% increase in page views per session. wpostats.com/2025/10/02/r...

I mentioned before that we’re switching Lighthouse Performance audits to the new and improved Insights. The same Insights that you can see in DevTools Performance panel traces. That’s happening in Lighthouse 13 due to be released very soon. Maybe even this week!

I've been implementing some improvements in my @11ty.dev blog, mostly related to performance and deferred code loading. I'm pretty happy with the results, and hope they might be useful to someone else too: infrequently.org/2025/10/11ty...

Esta semana hemos visto otro caso de marketing agresivo disfrazado de formación gratuita. Un curso online de 3 días anunciado como “gratuito” y con “certificado” que acabó siendo, en su último día, un embudo para vender un supuesto “Máster” de 1500 €. (1/4)

I'm in Liverpool this weekend. Chatted to a local old white bloke who spoke with pride about the city having the first mosque in the country, and the first chinatown. And… fuck, I needed to hear that kind of positivity.

Hey folks, I'm looking to schedule the next PerformanceObserver meetup and need some new CFP submissions. I have a few experienced #webperf speakers on there, but I like to break it up with either newer speakers or new-to-webperf speakers. performanceobserver.dev/call-for-pap...

Join us on September 16!

Well, dignity has left the building. I’m looking at walking pads for my standing desk. Fellow home office hamsters, which models are actually worth it? PS: Any "just take more steps" tips will be considered as emotional damages.

Really excited to be speaking @perfnow.nl this year—my favourite conference run by some of my favourite people! If you're into web performance (or wanna be!) and like a great conference with a super friendly vibe then pop along to Amsterdam at the end of October. Tickets selling fast! perfnow.nl

🚀 The #StateOfHTML 2025 survey is now open! ➡️ Take it now: survey.devographics.com/en-US/survey... 💡 Spending time to fill these out is an investment into your craft, as browsers are using the results to make prioritization decisions. You don't have to do it in one sitting (or even one device).

A 673 ms LCP is not terrible, but it could be better. I guess this LLM was trained using @timvereecke.bsky.social's Scalemates results 😂

Today we went for lunch at “El Pino,” a restaurant and pulpería in Vallirana (Barcelona). It’s our favorite restaurant in the area. I don’t have any pics because we ate everything before even thinking about taking pictures, but if you’re in the Barcelona metropolitan area, seriously, it’s worth it.

The State of HTML 2025 survey is now live! Big thanks to @lea.verou.me for taking the lead on selecting this year's questions and features, as well as suggesting quite a few improvements!

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/

Hey folks, the next episode for the ⁠Eleventy Meetup is going to be a week from today! @kajkandler.bsky.social and @mwdelaney.me will be speaking. It will be recorded, but only live attendees get access to Q&A and live shenanigans 🙂 11tymeetup.dev #11ty @11ty.dev

Los migrantes representan ya el 41% del empleo creado en los últimos 3 años y con un récord: 3 millones de extranjeros afiliados a la Seguridad Social. Su aportación a la economía es clave. El BCE calcula que son responsables del 80% del crecimiento del PIB. www.rtve.es/play/videos/...

Grok and the truth.

Ayer tuvimos la mala idea de cenar paella. En un camping. En Francia. Las señales eran claras, pero las ignoramos. Solo diré que volcaron arroz cocido con colorante, pimiento rojo, muslos de pollo y mejillones en una paellera fría. Lo trajeron más rápido que la bebida. Y no es una exageración 😅

Ready for #GoogleIOConnect #BuildWithGemini

“Female” and “woman” are now banned words in USA research grants. “‘I guess a word that's not on here is “men,”and I guess a word that I don't see on here is “white,” so I guess we'll see what's going on with white men and what they need,’ Fielding-Miller said.”