Firefox Performance

I spy with my little eye both INP and LCP enabled by default in the latest Safari Tech Preview.

What with Firefox landing INP in stable yesterday (on top of LCP that they already supported) this means we'll soon have cross-browser support for these two Core Web Vitals!

#interop2025 #CoreWebVitals

Nerdy stuff! @mozilla.org #Firefox just enabled support for #INP with v144 🎉

I dived into our raw RUMvision data. And yep, can confirm that it works when using Google's web-vitals #JavaScript library 😍

(updated) article + chart + baseline badges in a blogpost:
www.rumvision.com/blog/firefox...

Firefox 144 now supports INP! 🦊

We just shipped interactionId, the piece that makes Interaction to Next Paint work. It helps browsers connect events from the same interaction and measure how responsive pages really feel.

More here: blog.mozilla.org/performance/...

Ask a Fox event - AMA with the Web Performance team YouTube video by Mozilla Developer

youtube.com/live/apYYhHJINFY "ask me anything" with Mozilla's Web Performance team. Come and chat with us!

performance.sync() 2025 · Luma performance.sync() is a meet-up taking place on the evening before the performance.now on Wednesday October 29th! We are looking for speakers! Submit your…

performance.now() is coming!

The night before the conference, 29th of October, @mozilla.org organises performance.sync(), the pre-meetup where you can meet your peers to mentally prepare for two days of information overload. They're also looking for a few people to present.
luma.com/ziykhh4y

"Tight Mode": How Browsers Really Load Web Pages. Robin Marx @programmingart at #Fosdem

Standing room only for "How Browsers Really load Web Pages" by @programmingart.bsky.social #fosdem

FOSDEM 2025 - Schedule

That’s a wrap! Thank you to all of our speakers, and to everyone watching either in the room or on the live stream. While the #webperf is over, there’s a full day of sessions tomorrow! Check out fosdem.org/2025/schedule/ for details. #fosdem

Dave says hi back! 😉

Last, but certainly not least, we have @canova.bsky.social showing us how to collaborate using the Firefox Profiler. fosdem.org/2025/schedul... #webperf #fosdem

Eric Seckler is sharing how Google doubled the Speedometer score over the last two years and developed the LoadLine benchmark. fosdem.org/2025/schedul... linkedin.com/in/ericseckler #webperf #fosdem

FOSDEM 2025 - Web Performance

Yes, all videos will be posted to fosdem.org/2025/schedul... in the coming days.

FOSDEM 2025 - Stream UA2.220 (Guillissen)

Yes, you can watch live at live.fosdem.org/watch/ua2220

Alexander Krizhanovsky presenting a slide with the title “http streams” in front of an audience.

Alexander Krizhanovsky is now talking about scheduling HTTP streams fosdem.org/2025/schedul... fosdem.org/2025/schedul... #webperf #fosdem

At least 10 people in a room watching a live stream on a laptop.

The #webperf room was so full that folks were watching the live stream from just outside! #fosdem

Next up is @andydavies.me helping us to make sense of the Long Animation Frames API. fosdem.org/2025/schedul... #webperf #fosdem

We kick off with @programmingart.bsky.social showing us how browsers REALLY load web pages to a full room! 🤡 fosdem.org/2025/schedul...

FOSDEM 2025 - UA2.220 (Guillissen)

We’re looking forward to kicking off the #webperf devroom at @fosdem.bsky.social in a couple of hours! Check out the schedule and watch live at fosdem.org/2025/schedul...

FOSDEM 2025 - Web Performance

The schedule for the #webperf devroom at @fosdem.bsky.social 2025 has been published! Check it out at fosdem.org/2025/schedul... #fosdem

We’ve just released a Chrome extension for the Firefox Profiler! 🚀 See how it can enhance your performance workflow in our latest blog post!
blog.mozilla.org/performance/...

Hurry, there's just a few days left to submit a talk for the #webperf devroom at @fosdem.bsky.social 2025! wiki.mozilla.org/Performance/... #fosdem #cfp

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