Reposted by Gianni Rosato
⚡Featured posts this week:
✨ New ad metrics in CrUX: @alextcone.bsky.social
✨ The case against JPEG XL: @giannirosato.com
✨ Why Spotify Is Not Using Bayesian A/B Testing: Mattias Frånberg, Mårten Schultzberg
✨ International SEO: @polemicdigital.com
🙏 Special thanks to the authors!
#webperf
![“[sorry for the spam] Just wanted to say that theguardian.com is on `tune=iq` for the last two weeks (we serve AVIF to non-JXL-supporting browsers) and we couldn’t be more happy. Encoder consistency is much, much higher (still not as good as JXL, but that’s just an impression, not a rigorous assessment): some highly compressible images where delicate detail was being obliterated grown even ~3× in filesize and look much better while unnecessarily weighty images shrank, mostly without any perceptible degradation. Interestingly, we kept the same quality values (which differ by dpr) and as much as we can say, the overall bandwidth stayed more or less the same (I can’t see any change in the graph), so it’s likely the massive reduction of rare weighty images offset small images growing.
Huge thanks to juliobbv for his work on `tune=iq` and to whomever else worked on it. And to friends at our image CDN (Fastly). And to everyone here as without this server, I wouldn’t even know about it…
As always, we welcome improvements to any and all encoders. So the idea of “splitting Julio” couldn’t sound more exciting 😉.”](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:lj7y6n7ouwe2276ubo5cizaa/bafkreiabxrmpl67iegnifzu64fdckai6yjodzjneksoknqebyndshcjila)
