Launch RUMvision 2.0 - the future of RUM is here! Real User Monitoring

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-...

Gamma is nice if you want AI. I personally use Canva or Mentimeter when giving presentations.

Welcome to the Dutch favourite wholesome hobby😉

Yeah, the structure freaks me out haha

I'm so sorry to read that Katie. Take some well deserved time off and I'm sure you'll find a great new place soon!

Very nice😀

Love that it's back, it was a blast last year 😀

Promotional banner for “Fronteers Dark Mode” with the headline “Friday night. Frontend. Fronteers Dark Mode!” in bold black text on a bright yellow speech-bubble shape. Below it, the text invites people to join on Friday, October 2nd 2026, at Cinema De Witt in Dordrecht for an intimate evening of frontend talks and community vibes from 3PM to after midnight. The background shows a lively evening courtyard scene outside a cinema, with people sitting at tables, chatting under warm string lights, and a modern glass entrance glowing in the night. Colorful decorative shapes frame the top corners of the image.

+++ 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)

Yikes! Now what? Temporary go to a hotel or something? Any idea when it can be fixed?

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! 😀

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,...

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...

Chart of INP + LCP metrics in Safari over time

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

Thanks Stoyan😀 It's a fun group, you should learn more and join us if your interested in RUM. Just look at these Jolly group of co-chairs😂

WebKit Features for Safari 26.2 Safari 26.2 is a big release.

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...

Yep, that seems about right 😅 have fun though! Do a powernap as well!

Is Cloudflare down AGAIN? 😱

Nah, think it might always be bad looking at the data and the amount of client side rendering 😅 plus me being in the Netherlands is probably not helping either.

What on earth is happening with this shop from a Webperformance perspective though 😅

Oooh Clippy! But I might have to much IE trauma from my beginning years in tech to have it on a shirt🤣

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! 🤩

This is desperately needed on iOS.

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…

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...

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

Hello😉

Can't wait to read it, it's one of my favourite sources to reference, when making people aware of the difference in experiences that users have vs what they experience themselves

Worldwide smartphone shipments by year in millions; sources: IDC, Statista, and Counterpoint Research. At no point in the past decade have iPhones broken the 20% annual sales barrier. iOS is overrepresented in traffic statistics owing to wealth-correlated effects; e.g., faster networks and devices inducing heavier internet use. This does not imply that users on slower devices do not have money to spend, only that they are poorly served by the contemporary web.

Average selling prices in nominal USD for iOS (~$1000) and Android devices (~$300) vs. worldwide smartphone Average Selling Price (~$360). iPhones aren't real life.

Time series of single-core Geekbench 6 scores for 4 device classes: fastest iPhone, fastest Android, mid-range Android, and low-end device (~$100). The Performance Inequality Gap is growing, year on year, and the lower tiers are not even on the same trend line, let alone catching up.

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

This was performance.now() 2025 YouTube video by Web Conferences Amsterdam

A little aftermovie to whet your appetite.

www.youtube.com/watch?v=ByOC...