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Obs.js reads a handful of browser signals (Navigator and Battery APIs) to infer connection strength, battery status, and device capability. It exposes those signals as CSS classes on the
<html>element, and as properties on window.obs, so you can adapt delivery accordingly: serve lower-resolution media, forgo web fonts, disable auto-playing video… you name it.
Low- and Mid-Tier Mobile for the Real World (2025)
It’s important to remember that ‘low-tier’ does not mean old. Likewise, ‘mid-tier’ does not mean ‘a flagship from 2018’. They are a device class in…
Shubham Bose
Good UX is highly desired and once you get it right, it feels almost natural, intuitive. The current state of news UI assumes that the reader is an…
Raphaël Dardeau
De SPA à MPA : reprendre en main la performance
Avec une SPA, la performance dépend d’un temps d’exécution global de l’application, alors qu’avec une MPA, elle découle directement du travail réellement…
The present and potential future of progressive image rendering
So if the browser manages to download 6 kB then stalls, then AVIF can produce a better result. But since the AVIF rendering is only two-pass, if the…
Google On Why Google Search Console LCP Is Not Wrong
Caching should be a "cherry on top" to boost speed, rather than the only reason you have a fast site.
Harry Roberts 
Jake Archibald