How far ahead Chrome, Firefox and Safari fetch lazy media, why a lazy hero image slows your page, and where to use lazy, eager and fetchpriority.

Investigating JPEG XL's place as a Web image codec.

Les débats autour des consommations d’eau des “centres de données” ont pris diverses tournures ces dernières années, mais ne convergent pas vers un débat constructif basé sur des points de repères…

Glaciers outside Greenland and Antarctica have been rapidly losing mass. Contemporary ice declines are shown to be a response to past greenhouse gas emissions, with present mitigation efforts unlikely...

Alors que la rentrée approche, c’est aussi le cas de la fin du tarif réduit pour s’inscrire aux conférences et ateliers de Paris Web 2026. Il ne vous reste plus qu’une semaine pour en profiter ! Tout ...

How the CrUX 28-day rolling window actually works, what each source publishes, and why p75 takes so long to move even though the data is only two days old.

Find which network resources slow down page rendering. Check if your page depends on specific scripts or data.

Core Web Vitals data from ten leading online retailers reveals that "good" for Google may not be good enough for your users or your business.

Embedded in this year's network and device estimates is hopeful news about the trajectory of devices and networks. It has never been easier to deliver pages quickly, but we are not collectively hittin...

Publish an HTTPS DNS record. Let browsers reach HTTP/3 on the first connection instead of wasting a round trip.

My client was a utility company, and they had a big problem...

How does site speed relate to sales? Find out in this Shopify data deep dive.

How to use WebGPU to apply filters and transformations to images in the browser. Real benchmarks comparing with Canvas 2D.

Présentation des recherches du collectif DISNOVATION.ORG en lien avec l'écoconception numérique. DISNOVATION.ORG combine l’art contemporain, la recherche et le hacking pour traduire de manière crit...

If your design system can only apply `loading=lazy` or `fetchpriority=high` blindly, it may be safer not to apply them at all.

Compression Dictionary Transport (RFC 9842), authored by Patrick Meenan and Yoav Weiss, lets browsers...

Putting a YouTube video inside a closed details element means it won't load until that details element is opened. We can use that.

Depuis 2019, le site de L’Équipe a été construit autour d’une architecture SPA (pour Single Page Application). Dans cette configuration, le…

La Fondation Sahar lance ce lundi TrackCarbon, une nouvelle application grand public qui permet de mesurer l'empreinte carbone de l'intelligence artificielle. Un outil français, gratuit et open source...

Embedded in this year's network and device estimates is hopeful news about the trajectory of devices and networks. It has never been easier to deliver pages quickly, but we are not collectively hitting the mark. Indeed, the latest CrUX data shows not even half of origins have passing Core Web Vitals scores for mobile users. Browsers will need to provide stronger incentives. This will be unpopular, but it is clearly necessary.

If you have a statically generated website hosted on a CDN, it’s probably very fast (unless you add too much client-side JavaScript). However, for dynamically generated pages that load content from a...

Éco-conception et papier recyclé Mes premières notions d’éco-conception remontent à mon cursus d’étudiante en design, au début des lointaines années 2010. On nous parlait surtout d’impression, de …

C'est officiel, nous avons dépassé la 7e limite planétaire, celle de l'acidification des océans. C'était attendu par le