Riccardo Margiotta

Damn, that was a fast turnaround!

Phew, made it without any extravagant hand gestures this year. 😅 Maybe next year the trick is just to embrace it and go full @ethangardner.com?

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.

Could really do with a support group for this

Really nice write-up, Tim! And I spent way too long pinging that badge around. 😅

Blimey, that's some trip! Hope you had a couple of Wunderbars left for an occasional sugar boost. 🙂

Thanks Barry, I was curious to hear your thoughts on this. Did you have an 'ideal' activation rate in mind while setting the behaviour for the likes of moderate vs eager? (Side note: very cool to see the mobile viewport heuristics in your talk.)

"Let me show you my pet human."

I'm not sure how I feel about this part of Etsy's results: "About 1 in 14 prefetch requests was navigated to by the user."

The performance improvements are superb, but a 7% hit rate doesn't sound great for server usage and bandwidth. What do you think, #PerfNow? What's the right balance?

I'll never live this one down. 😂

I made it on time(ish) via a very dodgy bus ride. We were so crammed in that those other passengers are practically family now. 😅

Thanks for always bringing such positive energy, and being so welcoming to attendees old and new alike. I had a blast catching up - until next year! 🙂

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

Thanks Tammy, great to meet you too!

Hahaha, excellent. 😂 So good to meet you in person this year KK, thanks for bringing the enthusiasm and energy!

Great to meet you, Sean!

Another year of #PerfNow is done! My poor wee brain is full, but I've got so many practical takeaways to research and try. I've caught up with familiar faces, spoken to the very approachable 'big names' in the #webperf community, and met so many people for the first time. Can't wait to do it again.

No other TODO app will ever top this. 😂

"Family. The #webperf community is family."
- Dom Toretto

@rich-harris.dev #PerfNow

#PerfNow: BOO!

(A little jump-scare as you scroll. Happy Halloween!)

Always awesome to see folks - particularly a big site like Etsy - share their real world results! The #webperf community is so good at sharing for the benefit of everyone.

Super talk from @tunetheweb.com on Speculation Rules. Been nervous about using them for fear of false positives on things like Google Analytics. The upcoming prerender_until_script logic sounds like exactly what I need - you'll benefit from fetching subresources, but won't execute scripts.

#PerfNow

A wise man once said...
"Simple to use, progressive enhancement, built in APIs are the best!"
- @tunetheweb.com

Yep, he's onto something. loading=lazy and fetchpriority=high are wonderfully simple 'cheat codes', and some of my favourite additions to the world of #webperf.

#PerfNow

Surprised Pikachu GIF ALT: Surprised Pikachu GIF

Never admit to these things while being live captioned

@mmocny.com talking about some super cool new measurements coming to Chrome - such as the equivalent of LCP but for 'soft' navigations like those in SPAs. That has the potential to start measuring a huge blind spot affecting a very significant portion of the web.

#PerfNow #webperf

Be aware of "survivor bias" in your metrics. Users having a fast experience will view more pages and have longer sessions. Your RUM data is always inherently biased towards those with fast experiences.

@andydavies.me #PerfNow #webperf

Cross-browser testing is an act of user advocacy. As much as Chrome has pushed the web forward, if that's all we test we could be missing big gotchas. Meet users wherever they are, no matter the scenario. @timkadlec.bsky.social is crushing it, as the kids are saying these days.

#PerfNow #webperf

Be the interpreter for your non-technical stakeholders. Milliseconds don't mean much to most people, make the data relatable. "Now they get a smoother experience that's over 50% faster."

@ethangardner.com on making performance allies. #PerfNow #webperf

Don't forget about the 'soft' skills!
@ethangardner.com #PerfNow

So many of the optimisations we make for web performance make for a more sustainable web. So by improving your LCP or removing that unused legacy JavaScript, you're helping to save the planet. 🙂

@inesakrap.bsky.social #PerfNow #webperf