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performance.now() conference @perfnow.nl · 29/09/2026

Reminder: tickets get more expensive onThursday. There are only nine tickets in the middle bracket left. perfnow.nl/tickets.html

Screenshot of performance.now() ticket shop, with only nine mid-tier tickets left (highlighted).

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performance.now() conference @perfnow.nl · 22/09/2026

Oh dear, speakers are being announced in carload lots! Today we add bsky.app/profile/clif... about Core Mobile Vitals bsky.app/profile/jpam... as our second MC bsky.app/profile/mach... about selling web performance Come join them at perfnow.nl

perfnow.nl

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

On 19th and 20th of November 2026, the web performance community will gather at performance.now() in Amsterdam to discuss today’s most important web performance insights.

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performance.now() conference @perfnow.nl · 01/09/2026

Three new speakers were announced for perfnow.nl ! Aleth Gueguen about native web and PWAs. @adactio.com about long-term performance: not milliseconds but decades Risko Ruus about regression testing and other QA Tickets: perfnow.nl/tickets.html See you in November in Amsterdam!

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.

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Ethan Gardner @ethangardner.com · 18/06/2026

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!

youtube.com

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

YouTube video by Web Conferences Amsterdam

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Marcy Sutton Todd @marcysutton.com · 12/06/2026

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

youtu.be

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

YouTube video by Web Conferences Amsterdam

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Sergey Chernyshev @sergeyche.dev · 22/05/2026

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

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performance.now() conference @perfnow.nl · 11/05/2026

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

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performance.now() conference @perfnow.nl · 23/04/2026

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

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.

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performance.now() conference @perfnow.nl · 05/11/2025

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

perfnow.nl

performance.now() 2025 photos

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Michael Hladky @michael-hladky.bsky.social · 02/11/2025

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

docs.google.com

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

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

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rich harris @rich-harris.dev · 01/11/2025

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

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performance.now() conference @perfnow.nl · 01/11/2025

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

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Phil Hawksworth @philhawksworth.dev · 31/10/2025

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

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Riccardo Margiotta @riccardomargiotta.co.uk · 31/10/2025

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

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Keerthana Krishnan @keerthanak17.bsky.social · 31/10/2025

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

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Joan León @nucliweb.net · 31/10/2025

"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.

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Jack Franklin @jackf.io · 31/10/2025

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

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Barry Pollard @tunetheweb.com · 31/10/2025

@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

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Andrea Verlicchi @verlok.bsky.social · 31/10/2025

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!

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Tammy Everts 🍁 @tammyeverts.com · 31/10/2025

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

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Jacob "kurtextrem" Groß @kurtextrem.de · 31/10/2025

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

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Tim Kadlec @tkadlec.bsky.social · 31/10/2025

Always, always happy to see @yoav.ws get a shout-out. So much incredible work has happened because of him. Most recent example—speculation rules in WebKit. #perfnow

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Riccardo Margiotta @riccardomargiotta.co.uk · 31/10/2025

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

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David Ross @cdaveross.bsky.social · 31/10/2025

There's a sight to see, freshly published in time for #PerfNow. Talk by @tunetheweb.com , an excellent walkthrough on how to get the most out of a truly powerful tool www.etsy.com/codeascraft/...

A speaker in front of a stage, presenting a graph of Time to First Byte before & after a speculation rules experiment, writeup at https://www.etsy.com/codeascraft/search-prefetching-performance

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Riccardo Margiotta @riccardomargiotta.co.uk · 31/10/2025

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

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Stuart McMillan @stuart-mcmillan.com · 31/10/2025

One of my favourite pictures from 2023 #perfnow @tunetheweb.com @andydavies.me

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Chewsy @xchewsy.bsky.social · 31/10/2025

Hi #perfnow! I’m a first-year student from the Amsterdam University of Applied Sciences representing Frontend design and development. I’m in awe by all the amazing talks and knowledgable attendees!

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Karlijn Löwik @karlijnlowik.bsky.social · 31/10/2025

Halloween at #perfnow, pirates and vampires. A.k.a sword fight, the sequel. Or... How RUMvision slayed Akamai😇😆 (jk)

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Phil Hawksworth @philhawksworth.dev · 30/10/2025

“We should treat accessibility as something that is structural or baked in or part of the DNA, if we want to be successful” — says @marcysutton.com at #perfnow “Don’t treat it like trying to put chocolate chips into a cookie after it is baked” I love this framing!

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Stuart McMillan @stuart-mcmillan.com · 31/10/2025

Nextferatu... @programmingart.bsky.social #perfnow

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Keerthana Krishnan @keerthanak17.bsky.social · 31/10/2025

@adevnadia.bsky.social is not afraid to shout from the stage why she loves SPAs (while acknowledging their drawbacks) and on behalf of all FE devs, I would like to thank her for her bravery 🫡🙏🏻 #perfNow

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Tammy Everts 🍁 @tammyeverts.com · 31/10/2025

For #PerfNow folks (and other folks who are interested in front-end #webperf)… you should know that @adevnadia.bsky.social has written this amazing resource. www.getwebperf.com

getwebperf.com

Web Performance Fundamentals

A Frontend Developer’s Guide to Profile and Optimize React Web Apps

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Jason Williams @jason-williams.co.uk · 31/10/2025

Thanks @mmocny.com for the container timing shoutout and stealing my low effort diagram 😂 Great talk @ #perfnow

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Riccardo Margiotta @riccardomargiotta.co.uk · 31/10/2025

@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

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Keerthana Krishnan @keerthanak17.bsky.social · 31/10/2025

@programmingart.bsky.social and I are on the same page for a lot of things but I'm still learning from the master on how much drip a Halloween costume should have #perfNow

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