My friends over at RUMvision.com have sent me a lovely gift. I think my boys love it as much as I do, though they are mostly interested in fighting over occupation of the box. Thank you @jordyscholing.bsky.social, @erwinhofman.bsky.social and @karlijnlowik.bsky.social ❤️

Got a summer cocktail package from the nice folks at RUMVision Thanks @karlijnlowik.bsky.social @erwinhofman.bsky.social @jordyscholing.bsky.social 🍹🍹🍹🍹🍹🍹🍹

Not a good release 😱

RayBan x Meta glasses for debugging web performance in real-time?? hmm

Whuts good

RUMvision x Google webinar on Baseline: streamyard.com/watch/cvWaKV...

I'm looking for someone that's good in designing reporting emails + slack alerts that include the reports. HMU :)

Funny thing; I was checking Baseline support for view-transitions for a publisher client of our and noticed that the support for Safari was quite high... FYI: Safari supports view-transitions on version 18 or above. Combining Baseline with RUM data is goated...

We back

That was a fun year at RUMvision, onto an even better one :)

It might be time to rewatch game of thrones 😺

Typical... #corewebvitals #webperformance

Sleepy

Try talking in another language to your pets every now and then… you never know 🙂‍↔️

P75 is boring... 🥱 🥱 🥱

A side- effect of #speculationrules is that CrUX shows a degradation in TTFB. Reason? CrUX unfortunately excludes TTFB from pre-rendered pages (subsequent navigations). As a result, the CrUX dataset for TTFB contains a relatively larger amount of slower landing pages. #webperf

Messing around with AI and CrUX API

Aren't they cute?! #CatsOfBluesky

Beep beep

Some fun stats: The average Core Web Vitals of RUMvision domains (mobile P75) • LCP: 1988ms • CLS: 0.025 • INP: 198ms 😅 • FCP: 1356ms • TTFB: 767ms Q1 2025 I want that INP to be below 180ms. This is a sample of 25M datapoints.

Labeler??? What’s that

Too bad to see that when you are working hard to get a website to use bf_cache as much as possible, but an external party (Meta JS SDK) ensures that the percentage of bf_cache navigations is now back to square one. It was not an issue before, so I think there's been a change in their code?

Nothing better than fixing TTFB so you can fully work on front-end related optimizations...

Fixing INP with LoAF almost feels like a cheatcode

Which platform do you like most to do a #webperformance audit on?

We're excited to share that Mozilla and @wikimedia.bsky.social will once again be hosting a #webperf devroom at @fosdem.bsky.social 2025! The call for participation is open until December 1st. Find details on how to submit your proposal at wiki.mozilla.org/Performance/... #fosdem #cfp

Added Core Web Vitals status to our free tools... 😇 www.rumvision.com/tools/core-w... 😇 www.rumvision.com/tools/core-w...

The only downside of two day events at the end of the week is the fact that you’re fucked on Monday 🤨

Any good starterspacks for frontend dev?

What are all the reasons "real user metrics" for Core Web Vitals would differ from Google's PageSpeed Insights? I'll start: - RUM data may include non-Chrome browsers (For LCP and INP they would all be Chromiums) - Google only counts users who have Chrome sync on and opted into data sharing

Already suffering from post event depression.

Wasn’t that fun? #PerfNow

🌌Aiming for the stars by @anniesullie.bsky.social The last talk of #PerfNow 2024. Such a great, lovely and smart event we should all be proud of.

What about adding keyboard shortcuts in DevTools? CMD + 1 will go to the first tab etc etc. Is this already a feature? 😳 #perfnow

He knows what he’s talking about ( @tkadlec.bsky.social ) 😛 #perfnow

D-d-d day 2! #PerfNow

Normally I get out of bed at 8:45 😃 what I’m willing to do for #PerfNow… Goodmorning

Join :)

Should core web vitals thresholds be different in parts where it’s really hard to pass? 🤨 (Purely so that those companies can have the “SEO boost”) Bold question, but curious about your thoughts. #PerfNow

Straight up facts. #PerfNow

Great start to #perfnow this year with @tammyeverts.bsky.social and @csswizardry.com ! For those of you looking for the general web perf starter pack, here it is! Lots of new folks since last time I shared it go.bsky.app/RVWSVqe

Significant growth in how many videos we put on our sites, but also a good amount of extra JS 😤 #PerfNow @tammyeverts.bsky.social