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performance.now() conference

@perfnow.nl

A single track conference with fourteen world-class sessions covering today’s most important web performance insights. #perfnow https://perfnow.nl 19th and 20th of November, Amsterdam Curated by Tim Kadlec, Tammy Everts, Harry Roberts, and PPK

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performance.now() conference @perfnow.nl · last mo.

Reminder: ticket prices will go up by €100 + VAT this Wednesday, 1st of July. There are a few cheap tickets left. We also announced @patmeenan.com, @stephaniewalter.bsky.social and @programmingart.bsky.social (MC). perfnow.nl/tickets.html

performance.now(); 19th and 20th of November 2026, Amsterdam

On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

perfnow.nl

performance.now() conference @perfnow.nl · last mo.

Remember: ticket prices will go up by €100 + VAT next Wednesday, 1st of July. Grab your cheap tickets while you can. perfnow.nl/tickets.html

performance.now(); 19th and 20th of November 2026, Amsterdam

On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

perfnow.nl

Ethan Gardner @ethangardner.com · 2mo ago

My presentation, Making Performance Allies from @perfnow.nl just got posted to YouTube - www.youtube.com/watch?v=ygdx.... The tips I share in the presentation were designed to make #webperf stick beyond the occasional task that finds its way out of the backlog. Enjoy!

Making Performance Allies - Ethan Gardner - performance.now() 2025

YouTube video by Web Conferences Amsterdam

youtube.com

Marcy Sutton Todd @marcysutton.com · 2mo ago

My talk from @perfnow.nl is out! It was a super special time compiling years of information on Accessibility and Performance into one talk. Even cooler that my little family could be there in Amsterdam to see it. 💗 youtu.be/Fdvk_qOKjVM?... #a11y

Accessibility and Performance - Marcy Sutton Todd - performance.now() 2025

YouTube video by Web Conferences Amsterdam

youtu.be

performance.now() conference @perfnow.nl · 3mo ago

Six early-bird tickets left. Will they run out today? Or are you feeling lucky and wait for Monday? perfnow.nl/tickets.html

performance.now(); 19th and 20th of November 2026, Amsterdam

On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

perfnow.nl

Sergey Chernyshev @sergeyche.dev · 3mo ago

Ticket acquired. Can’t wait to see you all later this year! Go get yours!

performance.now() conference@perfnow.nl · 3mo ago

Ticket sales are open! perfnow.nl/tickets.html

performance.now() conference @perfnow.nl · 3mo ago

Ticket sales are open! perfnow.nl/tickets.html

performance.now(); 19th and 20th of November 2026, Amsterdam

On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

perfnow.nl

performance.now() conference @perfnow.nl · 3mo ago

We just sent out a TEST MAIL to our mailing list. Last year quite a few people didn't see the announcement mail and missed the early bird ticket sale. So this year we run a test first. If you're subscribed to our mailing list, please make sure you got the test mail. Or perfnow.nl/subscribe

performance.now() conference @perfnow.nl · 3mo ago

performance.now() 2026 is coming. Ticket sales will open in May with cheap and ultra-cheap early bird tickets. These will be announced in our newsletter first. So subscribe via perfnow.nl/subscribe perfnow.nl

performance.now(); 19th and 20th of November 2026, Amsterdam

On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

perfnow.nl

performance.now() conference @perfnow.nl · 3mo ago

performance.now(); 19th and 20th of November 2026, Amsterdam

On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

perfnow.nl

ppk 🇪🇺@quirksmode.org · 4mo ago

Conference organising in 2026 quirksmode.org/quirksblog/a...

Conference organising in 2026

Conference organisers have tough job because tickets are more difficult to sell these days. And a good conference circuit is typically something that you start to miss only when it's too late. Here a...

quirksmode.org

performance.now() conference @perfnow.nl · 9mo ago

2025 conference photos are up perfnow.nl/2025/pix/pho... (though I need to consult a speculation rules expert at some point)

performance.now() 2025 photos

perfnow.nl

performance.now() conference @perfnow.nl · 9mo ago

And the performance.sync() videos, the Wednesday pre-party, are also live. www.youtube.com/@WebConferen...

Web Conferences Amsterdam

We curate and organise deep-diving, single-track, content-focused web conferences, in Amsterdam. Most sessions, about 45 minutes each, include a Q&A session with the speaker. We aim to cover technique...

youtube.com

performance.now() conference @perfnow.nl · 9mo ago

Team photos are up. perfnow.nl/teams-2025.h...

performance.now(); 30th and 31st of October, Amsterdam

On 30th and 31st of October, 2025, the sixth edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.

perfnow.nl

performance.now() conference @perfnow.nl · 9mo ago

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

Michael Hladky @michael-hladky.bsky.social · 9mo ago

Here you go! My first perf now as a speaker… it’s was amazing 🤩 docs.google.com/presentation...

PerfNow25 - Big Data, Zero JS: Cross-Browser Virtual scrolling

Big Data, Zero JS Cross-Browser Virtual Scrolling CONTAIN & CONTENT-VISIBILITY

docs.google.com

rich harris @rich-harris.dev · 9mo ago

I shilled a javascript framework at a web perf conference and came out mostly unscathed, AMA

Joan León@nucliweb.net · 9mo ago

"0 kB of JavaScript is not a feature" - @rich-harris.dev #perfnow #WebPerf

A speaker is presenting at the performance.now() 2025 conference in front of an audience. The slide behind them reads “0 kB of JavaScript is not a feature,” with the second line highlighted in red.

performance.now() conference @perfnow.nl · 9mo ago

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

Phil Hawksworth @philhawksworth.dev · 9mo ago

Unsurprising revelation from #perfnow: @rich-harris.dev really is ruddy good at demonstrating interesting concepts. His @svelte.dev is demo is terribly compelling.

Rich Harris standing on a stage with a large screen behind him showing his live demo

Riccardo Margiotta @riccardomargiotta.co.uk · 9mo ago

"Family. The #webperf community is family." - Dom Toretto @rich-harris.dev #PerfNow

Keerthana Krishnan @keerthanak17.bsky.social · 9mo ago

@rich-harris.dev might have the best demo app I have ever seen 😁 at #perfNow

Joan León @nucliweb.net · 9mo ago

"SSR is about ~SEO~ performance" - @rich-harris.dev #perfnow #WebPerf

A speaker is presenting at the performance.now() 2025 conference in front of a large audience. The slide projected behind them reads “SSR is about SEO performance,” with “SEO” crossed out and “performance” emphasized in red.

Jack Franklin @jackf.io · 9mo ago

#perfnow absolutely fantastic and compelling demos from @rich-harris.dev but I'm trying to resist concerns on his preference for tabs over spaces...😂

Barry Pollard @tunetheweb.com · 9mo ago

@perfnow.nl for whoever asked that question about Sec-Purpose it DOES get set on sub-resources for prerendered speculations. Not just the document. #perfnow

Andrea Verlicchi @verlok.bsky.social · 9mo ago

It’s an honor to see my company #speedkit mentioned on stage at #perfnow by a web performance VIP and ambassador such as Barry @tunetheweb.com Pollard. 😊 Congrats to the Speed Kit team who implemented speculation rules in such an effective way in our product!

Andy Davies @andydavies.me · 9mo ago

Making Sense of Long Animation Frames… The slides from my #PerfNow talk are available on Notist noti.st/andydavies/9...

Making Sense of LoAF by Andy Davies

Over time the web has become more reliant on JavaScript… but we’ve very little information on how its growth is affecting our visitors’ experience.

noti.st

Ethan Gardner @ethangardner.com · 9mo ago

Here are mine: speakerdeck.com/ethangardner...

Web Performance Allies - PerfNow 2025

Image credits: https://commons.wikimedia.org/wiki/File:TAR_Detour_clue.png https://commons.wikimedia.org/wiki/File:Carach_Angren_M%C3%A9an_22_08_200…

speakerdeck.com

Harry Roberts @csswizardry.com · 9mo ago

speakerdeck.com/csswizardry/...

How to Think Like a Performance Engineer

As awareness and tooling around site speed have been improving at a very exciting rate, has performance testing actually become any easier? Any more str…

speakerdeck.com

Tammy Everts 🍁@tammyeverts.com · 9mo ago

Interesting! Etsy implemented speculation rules and got these results: 👍 Time to First Byte on the listing page improved 23.6% 👍 First Contentful Paint improved 20.7% 👍 Largest Contentful Paint improved 21.1% 👍 DOMContentLoaded improved 20.4% #PerfNow #webperf www.etsy.com/codeascraft/...

etsy.com

Jacob "kurtextrem" Groß @kurtextrem.de · 9mo ago

#PerfNow has incredibly interesting talks. Anyone who's serious about performance should join. Proud that we at @framer.com are sponsors.