Karlijn Löwik @karlijnlowik

YouTube video by Web Conferences Amsterdam This was performance.now() 2025

A little aftermovie to whet your appetite.

www.youtube.com/watch?v=ByOC...

04.11.2025 11:51 — 👍 19 🔁 6 💬 0 📌 1

Ha!

03.11.2025 15:20 — 👍 0 🔁 0 💬 1 📌 0

Superior language, duidelijk toch?😉

02.11.2025 18:08 — 👍 1 🔁 0 💬 0 📌 0

Major respect, that is a LONG trip!

02.11.2025 18:08 — 👍 0 🔁 0 💬 0 📌 0

They wanted to align with you on time zones. It was love😉

02.11.2025 18:07 — 👍 1 🔁 0 💬 1 📌 0

Was great to see you, see each other again next week😄

01.11.2025 21:41 — 👍 1 🔁 0 💬 0 📌 0

Glad it at least worked out😅

01.11.2025 17:26 — 👍 1 🔁 0 💬 0 📌 0

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

01.11.2025 08:21 — 👍 26 🔁 7 💬 0 📌 0

We had an amazing time at #perfnow once again! Thanks everyone ♥️

As a final note, old man yells at cloud @cliffcrocker.bsky.social, amazing costume!

01.11.2025 10:08 — 👍 15 🔁 0 💬 2 📌 0

Geen treinverkeer tussen Amsterdam en Schiphol Door geplande werkzaamheden reden er dit weekend sowieso al geen treinen tussen Amsterdam Centraal en Schiphol. Maar nu is er ook nog een seinstoring.

Folks from #perfnow, general PSA, there will be issues with ALL the trains to Schiphol Airport, not just Amsterdam Central, expected until 12.15

Article in Dutch: Geen treinverkeer tussen Amsterdam en Schiphol - nos.nl/l/2588749

01.11.2025 10:05 — 👍 2 🔁 0 💬 1 📌 0

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

31.10.2025 13:48 — 👍 17 🔁 3 💬 0 📌 0

Halloween at #perfnow, pirates and vampires. A.k.a sword fight, the sequel.

Or... How RUMvision slayed Akamai😇😆 (jk)

31.10.2025 13:45 — 👍 13 🔁 3 💬 1 📌 0

We had a great first Real User Meeting (a.k.a RUM RUM) at Google Amsterdam today via our W3C RUM Group today!

Great way to kick off #perfnow, with 70 people working on building a RUM+ updates from both Firefox and Chrome🚀😄

29.10.2025 16:02 — 👍 3 🔁 1 💬 0 📌 0

Traveling to the train, Dutch style (yes that is @erwinhofman.bsky.social juggling a suitcase on a bike😆)

29.10.2025 08:53 — 👍 5 🔁 0 💬 1 📌 0

Child dropped off, voted (it's general election today in the Netherlands) and on our way to #perfnow by train! See many of you in 3 hours at the RUM RUM at Google😀

29.10.2025 08:14 — 👍 4 🔁 0 💬 0 📌 0

With everyone in the webperformance sphere in the Netherlands for #perfnow let me send you a sunny picture from Mallorca😀 On our way back to NL tomorrow🇳🇱

27.10.2025 18:34 — 👍 1 🔁 0 💬 0 📌 0

Have fun sightseeing and don't forget to load up on both licorice and bitterballen😄🇳🇱

26.10.2025 17:09 — 👍 1 🔁 0 💬 0 📌 0

Release Notes for Safari Technology Preview 230 Safari Technology Preview Release 230 is now available for download for macOS Tahoe and macOS Sequoia.

Largest Contentful Paint (from Core Web Vitals) is now available in Safari Technology Preview.

webkit.org/blog/17504/r...

16.10.2025 20:53 — 👍 51 🔁 12 💬 4 📌 0

A circular laptop, with someone saying name one reason why you wouldnt buy this laptop, another that says, i'm a Frontend developer and this thing scares me

Ha. But also, yes, that is scary 😂

16.10.2025 10:26 — 👍 1 🔁 1 💬 0 📌 0

Live! Fast and Curious webinar with Jordy Scholing (RUMvision) and Wouter Steenmeijer (Elgentos), where they will break websites Core Web Vitals, and fix them again.

While messing around and answering important live questions like "Kroket vs Eierbal" Watch here: streamyard.com/watch/iUTmXn...

16.10.2025 09:12 — 👍 0 🔁 0 💬 0 📌 0

Safari TP 230 includes support for Largest Contentful Paint 🙌 #webperf

15.10.2025 21:27 — 👍 15 🔁 6 💬 1 📌 0

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

15.10.2025 21:49 — 👍 7 🔁 2 💬 0 📌 1

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...

15.10.2025 08:19 — 👍 19 🔁 8 💬 3 📌 0

Firefox 144 ships interactionId for INP – Mozilla Performance TL;DR Firefox 144 ships PerformanceEventTiming.interactionId, which lets browsers and tools group events that belong to the same user interaction. This property is used to calculate Interaction to Nex...

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/...

15.10.2025 12:46 — 👍 30 🔁 5 💬 0 📌 1

Oooh one of my favourite places to relax!

15.10.2025 13:20 — 👍 1 🔁 0 💬 1 📌 0

Enjoy! 😄

15.10.2025 07:08 — 👍 1 🔁 0 💬 1 📌 0

Ha! Hema now sells bitterballen stuffies, that is hilarious. And stroopwafel, rookworst and tompouce 😀🇳🇱

Love them.

11.10.2025 15:36 — 👍 1 🔁 0 💬 0 📌 0

I'm confident I will. Through the years I've learned I'm a very animated speaker, the photos are often.. interesting?

08.10.2025 21:50 — 👍 1 🔁 0 💬 0 📌 0

Guess who was feeling creative and made a prize for @erwinhofman.bsky.social upcoming SEO Benelux quiz 😉

08.10.2025 16:23 — 👍 3 🔁 0 💬 0 📌 0

I mentioned before that we’re switching Lighthouse Performance audits to the new and improved Insights. The same Insights that you can see in DevTools Performance panel traces.

That’s happening in Lighthouse 13 due to be released very soon. Maybe even this week!

07.10.2025 20:02 — 👍 27 🔁 13 💬 2 📌 0

Karlijn Löwik

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