Jan van Hellemond
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jvhellemond.nl
Jan van Hellemond
@jvhellemond.nl
Man who sold the world and is currently chasing payment.
👋
December 12, 2025 at 6:36 PM
Iets over hoofdletters? ;)
November 16, 2025 at 11:11 AM
Full Moon
Full Moon : Light, Michael: Amazon.nl: Books
www.amazon.nl
September 3, 2025 at 8:27 AM
Reposted by Jan van Hellemond
performance.now() is coming!

@adevnadia.bsky.social will provide a deep dive into the new React Server Components. How does the app render in the browser? What are their performance implications? How do they compare to traditional SSR and CSR techniques?

perfnow.nl/speakers.htm...
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
September 2, 2025 at 11:27 AM
This leaves a "Content-Disposition: form-data ..." header for each part, which should really be "Content-Disposition: attachment ..." for multipart/mixed, but them's the breaks.

2b/2
March 25, 2025 at 1:22 PM
- Replacing "/form-data" in the resulting content type header with "/mixed", crucially retaining the autmatically added (and otherwise opaque) "; boundary=--..." bit;
- Having a lie down 😅

2/2
March 25, 2025 at 1:20 PM
*perturbed
February 26, 2025 at 9:42 AM
Wel een collecte gedaan?
February 14, 2025 at 11:21 PM
Oh, my fave! Use it almost daily, mostly to squeeze a few more bytes of compression out of icons by removing redundant paths/points, swapping absolute/relative, rounding decimals and scaling.. I'm just listing all the features, aren't I?
February 14, 2025 at 11:21 PM
Law of the handicap of a head start - Wikipedia
en.wikipedia.org
January 31, 2025 at 12:55 PM
I once did something similar: sniffing for filetype by looking for things like "1f 8b" in the first n bytes. Faster than loading it and trusting mime types or extensions.

It was for a rather snazzy file upload component. Hmm, maybe I'll revive that, I hear there's a market for these things...
January 31, 2025 at 11:27 AM
Could have been worse; could have been a screenshot of Notepad++ pasted into a .docx and shared via WhatsApp #beenthere
January 8, 2025 at 9:51 AM