Karlijn LΓΆwik's Avatar

Karlijn LΓΆwik

@karlijnlowik.bsky.social

CEO & Co-founder @RUMvision | Simplifying web performance | Women in tech advocate | Toddler mom | International speaker | Lover of memes | Co-chair RUM W3C | Board member Mage-OS NL Feels like this bio is getting really longπŸ˜…

821 Followers  |  308 Following  |  187 Posts  |  Joined: 12.11.2024  |  1.8114

Latest posts by karlijnlowik.bsky.social on Bluesky

This was performance.now() 2025
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 β€” πŸ‘ 19    πŸ” 6    πŸ’¬ 0    πŸ“Œ 1
Post image

Ha!

03.11.2025 15:20 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Superior language, duidelijk toch?πŸ˜‰

02.11.2025 18:08 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Major respect, that is a LONG trip!

02.11.2025 18:08 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

They wanted to align with you on time zones. It was loveπŸ˜‰

02.11.2025 18:07 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Was great to see you, see each other again next weekπŸ˜„

01.11.2025 21:41 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Glad it at least worked outπŸ˜…

01.11.2025 17:26 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

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

01.11.2025 08:21 β€” πŸ‘ 26    πŸ” 7    πŸ’¬ 0    πŸ“Œ 0
Post image

We had an amazing time at #perfnow once again! Thanks everyone β™₯️

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

01.11.2025 10:08 β€” πŸ‘ 15    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0
Preview
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 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Post image

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

31.10.2025 13:48 β€” πŸ‘ 17    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0
Post image Post image

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

Or... How RUMvision slayed AkamaiπŸ˜‡πŸ˜† (jk)

31.10.2025 13:45 β€” πŸ‘ 13    πŸ” 3    πŸ’¬ 1    πŸ“Œ 0
Post image Post image Post image Post image

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 ChromeπŸš€πŸ˜„

29.10.2025 16:02 β€” πŸ‘ 3    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
Post image

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

29.10.2025 08:53 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Post image

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 GoogleπŸ˜€

29.10.2025 08:14 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Post image

With everyone in the webperformance sphere in the Netherlands for #perfnow let me send you a sunny picture from MallorcaπŸ˜€ On our way back to NL tomorrowπŸ‡³πŸ‡±

27.10.2025 18:34 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Have fun sightseeing and don't forget to load up on both licorice and bitterballenπŸ˜„πŸ‡³πŸ‡±

26.10.2025 17:09 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Release Notes for Safari Technology PreviewΒ 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 β€” πŸ‘ 51    πŸ” 12    πŸ’¬ 4    πŸ“Œ 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

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 πŸ˜‚

16.10.2025 10:26 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
Post image

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 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Safari TP 230 includes support for Largest Contentful Paint πŸ™Œ #webperf

15.10.2025 21:27 β€” πŸ‘ 15    πŸ” 6    πŸ’¬ 1    πŸ“Œ 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 β€” πŸ‘ 7    πŸ” 2    πŸ’¬ 0    πŸ“Œ 1
Post image

Nerdy stuff! @mozilla.org #Firefox just enabled support for #INP with v144 πŸŽ‰

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 β€” πŸ‘ 19    πŸ” 8    πŸ’¬ 3    πŸ“Œ 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 β€” πŸ‘ 30    πŸ” 5    πŸ’¬ 0    πŸ“Œ 1

Oooh one of my favourite places to relax!

15.10.2025 13:20 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Enjoy! πŸ˜„

15.10.2025 07:08 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Post image

Ha! Hema now sells bitterballen stuffies, that is hilarious. And stroopwafel, rookworst and tompouce πŸ˜€πŸ‡³πŸ‡±

Love them.

11.10.2025 15:36 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 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 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Post image

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

08.10.2025 16:23 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 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 β€” πŸ‘ 27    πŸ” 13    πŸ’¬ 2    πŸ“Œ 0

@karlijnlowik is following 20 prominent accounts