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...

🤔 Why do browsers throttle JavaScript timers?

> 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...

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...

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

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".

🏭 Datacenters, Cloud : comment mieux évaluer leur empreinte environnementale ? Quelles perspectives ? Quelles normes et réglementations ? https://buff.ly/3WnoDcV Merci à Rémy Marrone pour cette interview.

www.highperformancewebfonts.com/read/testing... is the first article on the newly "designed" HPWS resource

It's long past time we had a standard way to load CSS asynchronously. link[async] should work just like the tried and true print-media hack, but without the major downside of javascript reliance for applying CSS. Join me with a plus one here? github.com/whatwg/html/...

Made this loader codepen.io/thebabydino/... half a decade ago. Then it only worked in Chromium browsers with the Experimental Web Platform features flag enabled. As of 2024, it works cross-browser, no flags needed. Since someone hearting it reminded me of its existence, updated support info. #CSS

My Perf Calendar post made it just in time before the end of the year 😅 I wonked out on yielding strategies in loops, optimizing for more than just INP calendar.perfplanet.com/2024/breakin...

Nice use of the JS Self-Profiling API by @sentry.io to debug INP issues The fix was super satisfying too: replacing a slow JS library with pure CSS Anyone else have success with it? blog.sentry.io/improving-in...

I'm gradually cross-posting my work writing to my own site with canonical links to the original work post. I want to preserve them in case the original sites go down. Here's the first one... Struggling with loading speed on #Shopify sites? I've got you covered! #webperf sia.codes/posts/debugg...

Some of you complain that PageSpeed Insights is a bit unrealistically show for the Lighthouse test. The PSI servers are a bit underpowered so we're changing the throttling, which should make the Performance score go up when this rolls out in the next few weeks. github.com/GoogleChrome... 🧵 1/5

Did you know that jQuery outperforms React, what? 😳 Sounds like clickbait, but is reality. The HTTP Archive shows 82% of sites that use jQuery have good INP on mobile📱, while only 67% do when they use React⚛️. Not just sites, also libraries. Let's fix that👇#webperf kurtextrem.de/posts/improv...

Web Performance Calendar day 6 with Ana Boneva on instant pages and speculation rules and how we got here calendar.perfplanet.com/2024/the-evo...

My #wls2024 talk is available! I delved into advanced tuning techniques to make a modern website lightning fast. Using lots of charts and data, I showed how they helped make scalemates the fastest (and largest) modeling website in the world. www.youtube.com/watch?v=rjUr... #webperf

My talk from this year's We Love Speed is on YouTube! 👇 In "Tight Mode: how browsers REALLY load web pages", I take a very deep/very nerdy dive into why browsers sometimes intentionally delay loading resources, why they all do it differently, and why they should *stop clowning around* 🤡 #webperf

Énorme source d'informations, à jour sur la #webperf : la playlist des interventions à WeLoveSpeed Liens vidéo, slides et résumé des confs : www.welovespeed.com/2024/interve... Playlist Youtube : www.youtube.com/playlist?lis...

Can we please stop with the scroll-jacking carousels on websites? CSS Scroll Snap is a much better solution! Re-built the Uniqlo home page with 6 lines of CSS and 4 lines of JS Gotta link to the video, choose your poison in the next post

Hey folks, Who is doing interesting work relating to web performance in product teams or elsewhere in Latin America, Africa, Asia? #WebPerf #WebPerformance I'm looking to invite a few speakers for an event in London. Please share for reach. 🙏🏼

Ce jeudi à Rouen, j'aurais le plaisir de (re)parler des optis à faire sur les stacks JS actuelles www.codeursenseine.com/2024/programme

Did you know if your load you LCP image from another origin (e.g. an image CDN) then LCP time may not be reported properly in RUM (but is in CrUX)? Let’s dig into why, and also how we’re looking to fix this very soon… 🧵

All 17 performance mistakes: @paulcalvano.bsky.social #webperf #PerfNow

Planet Performance Calendar is a one-article-a-day Advent -style publication that runs in December since 2009, focused on Web Performance. If you (or anyone you know) want to share your experience, tool, research, rant with the #webperf community, please reach out calendar.perfplanet.com/contribute/