Pourquoi et comment réduire l'INP ? Use case sur l'équivalent italien de Le Bon Coin :
dev.to/subito/how-w...
* -100ms d'INP = +5% d'engagement
* méthode empirique à base de tests A/B pour trouver les coupables
* GTM bien sûr, mais aussi tiktok et facebook
* React compiler fait ses preuves en prod
lazyload d'embed, même immédiatement visible : l'astuce sans JS avec <details>
frontendmasters.com/blog/perform...
How do you measure when a component is “ready”? ⏱️
LCP is too global; Element Timing is too specific.
🛠️ I’ve been working with Bloomberg on a new #webperf API: Container Timing. Think of it as “LCP for a web component”, providing aggregated paint timing for a subtree.
Sortir de la SPA = meilleurs perfs, par @lequipe-actu.bsky.social : medium.com/lequipe-tech...
Française, gratuite, open source, la nouvelle application qui mesure l'empreinte carbone de l'IA est lancée www.clubic.com/actualite-59... #trackCarbon
très juste, mais ce qu'a voulu tester l'auteur, c'est une question qu'on a tous : le PNG est en quelque sorte inerte une fois rendu, mais un SVG, ça reste un truc vivant dans le DOM, qui l'a alourdit, et qui donc peut gêner l'interprétation au moment où JS en a besoin
une image, c'est des pixels déjà tout fait, le temps de décodage est minime pour des dimensions d'affichage classiques.
Un SVG, c'est d'abord du code à interpréter, quelques calculs à faire. Ça pourrait, en théorie, prendre plus de temps processeur pendant que tu cliques sur la page
Un SVG complexe alourdit il la page ? Comparaison avec le PNG
En résumé :
- jusqu'à 2 Mo de code, le SVG est plus léger que sa conversion en PNG.
- l'INP avec un SVG dans la page est équivalent au PNG, jusqu'à 400 Ko de code SVG.
Screenshot of a performance trace in Chrome DevTools with a few additional "Nav*" and "LCP*" markers. Hovering over the "LCP*" shows this is a "Soft LCP" and in the Summary panel when you click on it you see "Soft Largest Contentful Paint" and a "Learn more about Soft Largest Contentful Paint" link.
From Chrome 145 (on general release next week!), DevTools we will start to show so called "soft" navigations and "Soft LCP" in the Performance Panel traces.
These are for SPAs which don't do a full page load, but instead "fake it" by updating the current page and pushing a new history entry.
1/5 🧵
Un an de recherche
352 datacenters en activité, 65 projets identifiés
des centaines de vues satellite analysées
8,16 TWh de consommation en 2024, hors salles IT dans les batiments tertiaires
(also available in english)
Étude sur ce que voient les crawlers des chatbots IA, notamment des infos sur le temps max d'attente et l'interprétation de JS, mais aussi des frames ou du shadow DOM
think.resoneo.com/sentinel/geo...
Morale habituelle : être performant, HTML est la base + des surprises
The Performance Inequality Gap, 2026 - Infrequently Noted
🔖 https://infrequently.org/2025/11/performance-inequality-gap-2026/
🔗 https://ellyloel.com/the-performance-inequality-gap-2026-infrequently-noted/
#Bookmarks #Performance #Web
Web Performance Calendar'25 day 1 with @mb21.bsky.social on HTTP streaming in the world of HTTP2/3 and Node. Mauro shows us how to start rendering earlier, turning a slow (full) page load into a progressive experience using db.stream() in JavaScript
calendar.perfplanet.com/2025/improve...
Quel avenir pour l’esthétique web éco-conçue ?, par Esther Jacquet via @paris-web.fr
#24JoursDeWeb
www.24joursdeweb.fr/2025/quel-av...
#JavaScript: When it comes to breaking up long tasks, the scheduler API seems quite convenient:
await scheduler.yield();
Alas, not supported by Safari yet: caniuse.com/mdn-api_sche...
Thankfully, providing your own fallback implementation is easy: web.dev/articles/opt...
I co-wrote a post on the Etsy engineering blog about implementing Speculation Rules API (SRA) to prefetch product listing pages from search results. And many thanks to @tunetheweb.com and @cdaveross.bsky.social for the help and support!
www.etsy.com/codeascraft/...
Screenshot of Vercel cancellation screen with feedback mentioning Guillermo's support of a genocidal war criminal
Hits like crack
C’est officiel, nous avons dépassé la 7e limite planétaire, celle de l’acidification des océans.
Vous ne lirez rien de plus important aujourd'hui. A partager massivement !
bonpote.com/la-7e-limite...
> Peak CPU performance was probably hit in 2017.
With that perspective, you start... (ahem)... "rethinking best practices".
@infrequently.org's @jsnation.gitnation.org talk is pretty worthwhile and digs into the CPU limitations of the main thread.
gitnation.com/contents/pro...
New blog post about #CSS masonry layout, the (fairly) new Item Flow proposal, maybe subsuming multicol, and a light tingling from my Web-Sense. That last part isn’t NSFW, I promise. (Sorry, @brucel.bsky.social.) meyerweb.com/eric/thought...
Photo of the VueConf US 2025 stage during Daniel Roe's talk on the State of Nuxt 2025 where he announces fontless - a Vite plugin to apply "Magical plug-and-play font optimization for modern web applications"
During the keynote of @vueconf.us, @danielroe.dev releases `fontless` - a @vite.dev plugin to apply "magical plug-and-play font optimization".
Created in collab with the @qwik.dev team
This is basically the @nuxt.com fonts module, but for all Vite-based apps 🤯
Finally, a LoAF explainer I understand!
The LoAF API is a leap forward for RUM. It lets us find and fix the third parties and other JS that hurts #pagespeed and #UX. The catch? It's tricky to understand. But no longer, thanks to this piece by @andydavies.me!
www.speedcurve.com/blog/guide-l...
📧 Impact environnemental de l'email : dépasser les sujets d'optimisation technique.
Pour le service mail d'Iroco, David Ekchajzer, Bruno Thomas et Adeline Agut, ont réalisé une analyse des gains environnementaux potentiels de plusieurs leviers d'éco-conception.
www.youtube.com/watch?v=RNxz...
Quelques infos sur le comportement des français vis-à-vis de leur téléphone dont l'obsolescence est visiblement programmée
limitesnumeriques.fr/travaux-prod...
Hi
Do you have an idea why a recent chrome on Android refuses to work ?
I was so interested to know what's going on Android (my current conclusion is that Roboto is the only reliably installed font)
La dernière étude GreenIT sur l'impact global du numérique est sortie : greenit.eco/wp-content/u....
Un petit chiffre : le numérique pour un individu connecté c'est déjà 40% de son budget GES dit "soutenable" (on se limite à 1,5° d'augmentation de la T° globale). Après il faut qu'il mange …
Tip to prevent videos from impacting page load:
- Set a low-quality poster image with the `poster` attribute
- Set `preload="none"` (only works if there's a poster)
The latter tells the browser to avoid downloading the video file until the user requests playback.
C'est un événement qui n'arrive que deux fois par décennie : une nouvelle étude de l'Association Green IT sur l'impact du numérique mondial !
Rejoignez nous le mardi 4 février à 17h.
Pour vous inscrire, c’est par ici : t.ly/ptcagtw25
prices for the fastest iOS and Android devices, as well as volume segment SKUs from big vendors. The global ASP finally broke $350 this year, hitting a high of $365 (new, unlocked, worldwide). One way to think of this is *five* $200 Androids sold for every iOS device (it's not literally that, but that's broadly on-track as to what has happened over the past decade).
The software might be a steaming pile, but Apple's CPUs are pretty fast. On the hardware side, you get a lot of what you pay for in iOS-land. The same couldn't be said of Androids until this year, when Qualcomm and MediaTek finally got the led out on cache sizings.
Maybe she's born with it? Maybe it's....huge amounts of die size dedicated to caches? Why yes. It is. iPhones are fast because Apple charges an arm and a leg, but is willing to spend on die size and early access to smaller process nodes in return. It's a goddamned scandal that Android ecosystem SoC vendors have been so far behind on this, but now we can see that the reason Androids have been so slow has been exactly what I've been banging on about: cores don't get you speed, keeping cores *fed* gets you speed. And that's what cache does.
Frontend has been lost in delusions about the relative costs of client-side resources. But the facts are stubborn: smartphone ASPs only broke $350 worldwide for the first time in 2024. That's lower than any i-Device sells for.
The "I" in iPhone stands for "inequality".
