Ready for Fronteers Dark Mode, lights going off now 😄

High on anesthesia from getting my wisdom tooth removed, let me share you a classic case of my bad sense of humor😉

Watching the eclipse today from our balcony in Groningen, the Netherlands. Really cool, and very clear sky! 😀

So proud of our team! RUMvision 2.0 is live - a total rewrite from the ground up. We're making web performance actionable so every click counts. New UI, API, and automated to do's (with fixes) on your real-time data. Happy but tired now 😉 www.rumvision.com/blog/launch-...

Launch RUMvision 2.0 - the future of RUM is here!

Real User Monitoring

rumvision.com

+++ Tickets are now on sale for Fronteers Dark Mode 2026! 🥳 +++ 📍 Oct 2 · Cinema de Witt, Dordrecht 🕒 3PM – ~midnight 🎤 5 talks 🍽️ 2-course dinner included Relaxed after-work vibes, long breaks & great conversations. 🎟️ €99 👉 fronteersconf.org (Fronteers members: €49)

The 2025 Web Almanac by HTTP Archive has been officially released! 🚀 We would like to thank all of our contributors from around the globe who made this extensive report possible! Check out the full report here: almanac.httparchive.org

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

For @programmingart.bsky.social, happy holidays everyone! 😀

Web Performance Calendar day 24 with @programmingart.bsky.social on TTFB. Yes, it's one of those X-mas Eves where we cuddle by the fire, drop everything and immerse into re-learning and re-evaluating what we thought we knew about a concept we use daily calendar.perfplanet.com/2025/ttfb-do...

TTFB doesn't mean what you think it means

Time-To-First-Byte (TTFB) is a popular performance metric, yet there are many problems and nuances with it. Not only does it have several different definitions, it is usually also a "compound" metric,...

calendar.perfplanet.com

Look at that 🤩 Safari now supports #LCP and #INP as well! And we can clearly see it in our data 💪 Dates: 🗓️ Nov 3rd: Safari rolled out support in their 26.2 beta release 🗓️ Dec 12th: Safari released it to the public Huge update from the WebKit team, and for #CoreWebVitals in general 👏 1/3

Safari 26.2 is here with 65 features + 165 bug fixes — including field-sizing, Navigation API, Largest Contentful Paint, command & commandfor, CHIPS opt-in partitioned cookies, scrollend event, random(), WebGPU in WebXR, scrollbar-color, hidden=until-found and much more! webkit.org/blog/17640/w...

WebKit Features for Safari 26.2

Safari 26.2 is a big release.

webkit.org

Is Cloudflare down AGAIN? 😱

Might we all get a Chrome Dino in our stockings next Christmas? Apparently the people want it, it got 10k votes😄 (I totally want one) beta.ideas.lego.com/product-idea...

Yeeeessssss! 🤩

IntentToShip@intenttoship.dev · 11mo ago

Gecko: Intent to prototype and ship: View transition types

This is desperately needed on iOS.

Patrick Brosset@patrickbrosset.com · 11mo ago

On the Edge team, we think web apps should be easier to install. The default browser install button is great, but we'd like something which you can use on your own site, how and when you want it. That's why we're proposing the Web Install API, which you can now test!

Inspired by perfnow.nl, I've dusted off drafts of my network and device situation analysis. Good news/bad news: devices and networks are improving, but pages are swelling. The web is usable for the wealthy, but less so for everyone else. infrequently.org/2025/11/perf...

The Performance Inequality Gap, 2026 - Infrequently Noted

Embedded in this year's network and device estimates is hopeful news about the trajectory of devices and networks. It has never been easier to deliver pages quickly, but we are not collectively…

infrequently.org

Gosh, such a hard life. On the race track of F1 in Zandvoort😄

The "i" in "iPhone" stands for "inequality", late 2025 edition:

A little aftermovie to whet your appetite. www.youtube.com/watch?v=ByOC...

This was performance.now() 2025

YouTube video by Web Conferences Amsterdam

youtube.com

Ha!

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

We had an amazing time at #perfnow once again! Thanks everyone ♥️ As a final note, old man yells at cloud @cliffcrocker.bsky.social, amazing costume!

Folks from #perfnow, general PSA, there will be issues with ALL the trains to Schiphol Airport, not just Amsterdam Central, expected until 12.15 Article in Dutch: Geen treinverkeer tussen Amsterdam en Schiphol - nos.nl/l/2588749

Geen treinverkeer tussen Amsterdam en Schiphol

Door geplande werkzaamheden reden er dit weekend sowieso al geen treinen tussen Amsterdam Centraal en Schiphol. Maar nu is er ook nog een seinstoring.

nos.nl

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

Halloween at #perfnow, pirates and vampires. A.k.a sword fight, the sequel. Or... How RUMvision slayed Akamai😇😆 (jk)

We had a great first Real User Meeting (a.k.a RUM RUM) at Google Amsterdam today via our W3C RUM Group today! Great way to kick off #perfnow, with 70 people working on building a RUM+ updates from both Firefox and Chrome🚀😄

Traveling to the train, Dutch style (yes that is @erwinhofman.bsky.social juggling a suitcase on a bike😆)

Child dropped off, voted (it's general election today in the Netherlands) and on our way to #perfnow by train! See many of you in 3 hours at the RUM RUM at Google😀

With everyone in the webperformance sphere in the Netherlands for #perfnow let me send you a sunny picture from Mallorca😀 On our way back to NL tomorrow🇳🇱

Largest Contentful Paint (from Core Web Vitals) is now available in Safari Technology Preview. webkit.org/blog/17504/r...