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 PPKhttps://bsky.app/profile/perfnow.nlhttps://bsky.app/profile/perfnow.nl/post/3my7wclscek2fSmall changes can mean death by a thousand cuts for your performance. This talk is about what Risko learned about regressions, where the numbers lied, unrealistic throttling, and why "LCP doubled" isn't always bad news. You'll leave with a tester's view of web performance. Risko Ruus at perfnow.nl19 Oct 2026 10:35 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3my7wclscek2fhttps://bsky.app/profile/perfnow.nl/post/3mxyhecktec26What if we could provide websites that have the ability to do their thing while being offline? In this talk, I’ll show you how I’ve harnessed the native web APIs to implement offline capabilities while minimizing the amount of Javascript to execute in the browser. Aleth Gueguen at perfnow.nl16 Oct 2026 11:18 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mxyhecktec26https://bsky.app/profile/perfnow.nl/post/3mxvyvrokmc2dDesigners see performance as a constraint, or as a checklist item: “don’t forget the spinner.” What if we saw it as a design opportunity instead? This talk explores what developers should expect from their designers and how to ask for it. @stephaniewalter.bsky.social at perfnow.nl15 Oct 2026 11:54 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mxvyvrokmc2dhttps://bsky.app/profile/perfnow.nl/post/3mxtest3z7k2fMobile Core Web Vitals are being built with real user data, and are tied to both business impact and a specific fix. But a lot doesn't transfer from the web: LC assumes a page load, CLS a document. This talk shares the first public look at Mobile CWV. @cliffcrocker.bsky.social at perfnow.nl14 Oct 2026 10:50 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mxtest3z7k2fhttps://bsky.app/profile/perfnow.nl/post/3mxqu3jgvhs2fWhy is speed so hard to sell? Martin will look at where familiar arguments fail, what WebPerf can learn from SEO, and why ownership and incentives matter as much as metrics. You will leave with practical tips to turn performance into prioritized work. @machal.bsky.social at perfnow.nl13 Oct 2026 10:45 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mxqu3jgvhs2fhttps://bsky.app/profile/perfnow.nl/post/3mxokzzh62s2fIf we look at a few decades of web performance, what technologies and techniques worked, what didn’t, what made the most difference, what has stood the test of time? Making a fast website is challenging enough; keeping a website fast is harder! @adactio.com at perfnow.nl12 Oct 2026 12:58 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mxokzzh62s2fhttps://bsky.app/profile/perfnow.nl/post/3mwnwkukk3k2tReminder: tickets get more expensive onThursday. There are only nine tickets in the middle bracket left. perfnow.nl/tickets.html29 Sep 2026 13:26 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mwnwkukk3k2thttps://bsky.app/profile/perfnow.nl/post/3mw3ytsd6xs2tOh dear, speakers are being announced in carload lots! Today we add https://bsky.app/profile/cliffcrocker.bsky.social about Core Mobile Vitals https://bsky.app/profile/jpamental.bsky.social as our second MC https://bsky.app/profile/machal.bsky.social about selling web performance Come join them at perfnow.nl http://perfnow.nl22 Sep 2026 10:19 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mw3ytsd6xs2thttps://bsky.app/profile/perfnow.nl/post/3muh46dj4ds2oThree 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! https://perfnow.nl01 Sep 2026 09:27 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3muh46dj4ds2ohttps://bsky.app/profile/perfnow.nl/post/3mpg2u2qrzk2pReminder: 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 https://perfnow.nl/tickets.html29 Jun 2026 08:25 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mpg2u2qrzk2phttps://bsky.app/profile/perfnow.nl/post/3mp4etknpzs2gRemember: ticket prices will go up by €100 + VAT next Wednesday, 1st of July. Grab your cheap tickets while you can. perfnow.nl/tickets.html https://perfnow.nl/tickets.html25 Jun 2026 11:57 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mp4etknpzs2ghttps://bsky.app/profile/perfnow.nl/post/3mmgrxaj2lk2iSix early-bird tickets left. Will they run out today? Or are you feeling lucky and wait for Monday? perfnow.nl/tickets.html https://perfnow.nl/tickets.html22 May 2026 11:03 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mmgrxaj2lk2ihttps://bsky.app/profile/perfnow.nl/post/3mme4fiqmy22iTicket sales are open! perfnow.nl/tickets.html https://perfnow.nl/tickets.html21 May 2026 09:32 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mme4fiqmy22ihttps://bsky.app/profile/perfnow.nl/post/3mlladwjxsc2yWe 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/subscribe11 May 2026 12:06 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mlladwjxsc2yhttps://bsky.app/profile/perfnow.nl/post/3mk63r4pfak2vperformance.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 https://perfnow.nl23 Apr 2026 13:14 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mk63r4pfak2vhttps://bsky.app/profile/perfnow.nl/post/3mk63r4pfak2vperformance.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 https://perfnow.nl23 Apr 2026 13:14 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3mk63r4pfak2vhttps://bsky.app/profile/perfnow.nl/post/3m4uws4rydk2k2025 conference photos are up https://perfnow.nl/2025/pix/photos/ (though I need to consult a speculation rules expert at some point)05 Nov 2025 11:24 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3m4uws4rydk2khttps://bsky.app/profile/perfnow.nl/post/3m4uvgf4nkc2kAnd the performance.sync() videos, the Wednesday pre-party, are also live. https://www.youtube.com/@WebConferencesAmsterdam/videos05 Nov 2025 10:59 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3m4uvgf4nkc2khttps://bsky.app/profile/perfnow.nl/post/3m4umx7qyhc2kTeam photos are up. https://perfnow.nl/teams-2025.html05 Nov 2025 08:28 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3m4umx7qyhc2khttps://bsky.app/profile/perfnow.nl/post/3m4shu3fpl22kA little aftermovie to whet your appetite. https://www.youtube.com/watch?v=ByOC2rcJX9U04 Nov 2025 11:51 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3m4shu3fpl22khttps://bsky.app/profile/perfnow.nl/post/3m4kkp2dz3k22performance.now() 2026 will take place on 19th and 20th of November 2026. #perfnow.01 Nov 2025 08:21 +0000at://did:plc:bed74btbdlowfhux3roj2eb4/app.bsky.feed.post/3m4kkp2dz3k22