🤩 How wonderful! Split View is coming to @developer.chrome.com 🥰, and you can already try it out in the Canary version #Chrome #Browser

Aquesta és l'agenda del DevFest Girona 2025 #DevFest #DevFestGirona #DevFest25

🆕 The 202510 Chrome User Experience (CrUX) release is now live on BigQuery! Check out the announcement post for the full info: groups.google.com/a/chromium.o... Highlights below 👇 🧵 1/3

I just wrote 'October 2025 Theme Vitals Update'. themevitals.com/newsletter/2... #webperf #Shopify

I'm excited to share a fantastic YouTube channel dedicated to Web Performance It's a project led by 2 major references in the Web Performance community, @guaca.bsky.social & @sia.codes www.youtube.com/@Performance... Subscribe to stay up-to-date & learn from the best in the community! #WebPerf

Episode 8 is next week on Nov 19! Come join us live for access to Q&A and general chat! We have @aarontgrogg.bsky.social talking about reducing JS workload and @mattzeunert.com walking through synthetic testing with DebugBear! #webperf All details and add-to-calendar at performanceobserver.dev

📣 New in Web Performance! We can now use the WebPerf Snippets for LCP & INP in Safari Technology Preview This allows us to measure 2 of the most critical Core Web Vitals metrics directly within Apple's browser Time to test! webperf-snippets.nucliweb.net #WebPerf #Safari #CoreWebVitals #LCP #INP

My gist “How Browsers Work” has been updated with a new post: “How modern browsers work” by @addyosmani.bsky.social gist.github.com/nucliweb/c16... #WebPerf #Browser #WebDevelopment

📺 Developer Tooling Tips Explore DevTools and boost your web debugging skills with these bite-size DevTools tips and tricks, by @developer.chrome.com youtube.com/playlist?lis... #WebPerf #Performance #DevTools #PerfTools #WebTools

Debugging de INP: Del 'algo va lento' al 'esto es lo que lo rompe' Ahora nos enfrentamos a la tarea más importante: entender qué es lo que está causando esos frames lentos y, en última instancia, rompiendo nuestro INP. joanleon.dev/posts/loaf/d... #WebPerf #INP #LoAF #Performance

2025 conference photos are up perfnow.nl/2025/pix/pho... (though I need to consult a speculation rules expert at some point)

I use several tools to debug and monitor web performance. One of them is @debugbear.com, which helps me track and alert on performance issues — like the one shown here. If you care about performance, I recommend giving @debugbear.com a try. #WebPerf #PerfTools #Performance #monitoring

How to optimize SVG files: A complete guide for beginners penpot.app/blog/how-to-... by @laurakalbag.bsky.social #WebPerf #ImagePerf #SVG #Image

Chrome Canary now supports network throttling for individual request URLs! Learn how to try out this new feature: www.debugbear.com/blog/chrome-...

Fundamentos de Long Animation Frames API Descubre cómo Long Animation Frames API (LoAF) resuelve el mayor problema al debuggear INP: saber exactamente qué código causó una interacción lenta. Fundamentos, código práctico y conceptos clave joanleon.dev/posts/loaf/f... #WebPerf #INP #PerfTools #LoAF

We have new stickers 🥰

New stickers for the WebPerf Snippets project webperf-snippets.nucliweb.net #WebPerf #WebPerfSnippets #PerfTools

A little aftermovie to whet your appetite. www.youtube.com/watch?v=ByOC...

If you are interested and want to learn about Web Performance, I recommend subscribing to @henrihelvetica.bsky.social's channel, where you will find high-quality videos from leading figures in the Web Performance community 📺 www.youtube.com/@HenriHelvet... #WebPerf #Performance #Learning #YouTube

📢 New blog post! Running Node.js 🐢🚀 in a Hugging Face 🤗 Space: blog.tomayac.com/2025/11/03/r... I found out about Hugging Face Spaces and that it supports Docker, which allowed me to create an evergreen template for running Node.js in a Hugging Face Space.

Glad to announce that my team at @cloudflare.social released a 1.0.0 version of a cross-browser web performance testing agent that supports Chrome, Firefox, Safari and Edge. Thank you to @tkadlec.bsky.social for making it happen and writing most of the code so far! github.com/cloudflare/t...

I shilled a javascript framework at a web perf conference and came out mostly unscathed, AMA

"0 kB of JavaScript is not a feature" - @rich-harris.dev #perfnow #WebPerf

"SSR is about ~SEO~ performance" - @rich-harris.dev #perfnow #WebPerf

Huge thanks to @andydavies.me for mentioning the LoAF Helpers WebPerf Snippet at @perfnow.nl! Honored to be part of the amazing Web Performance community 🫶 🔗 webperf-snippets.nucliweb.net/Interaction/... #WebPerf #PerfNow #Performance #LoAF #INP #CoreWebVitals

Neat lil learning from today’s @perfnow.nl (via Umar Hansa): You can now throttle individual requests in Chrome! Neat for experimenting with stuff like - lazy-loading: does the UI look okay if this chunk takes MUCH longer to arrive - resilience: what happens if this specific CDN is extremely slow

Fellow #perfnow fellows, a reminder that PerfPlanet calendar is coming this December for another edition. And it needs YOU. Please ask if you have any contribution ideas or concerns calendar.perfplanet.com/contribute/

Optimize images for sustainability "Ensure images, if required, are optimized, correctly formatted, and sized, with lazy loading as appropriate, and are managed effectively." - via @inesakrap.bsky.social's talk at @perfnow.nl w3c.github.io/sustainablew... #PerfNow #WebPerf #ImagePerf

Awesome talk @michael-hladky.bsky.social at @perfnow.nl 👏 I 🫶 seeing people talk about optimizing #webperf with CSS Btw, regarding content-visibility, in this PR you can find a video explaining the issue where the browser frees nodes outside the viewport from memory github.com/nucliweb/rea...

This year, I’m following @perfnow.nl online. To all attendees, enjoy it! ☺️ #perfnow #WebPerf

It's day 1 of #perfnow, I am live blogging conference notes here: stuart-mcmillan.com/blog/webperf... @perfnow.nl

Loren Stewart built the Same App 10 Times: Evaluating Frameworks for Mobile Performance www.lorenstew.art/blog/10-kanb... #WebPerf #Performance #Frontend

BTW, here's our 2025 speakers starter pack: go.bsky.app/3tyzfGe

Advanced CPU Profiling in Node 1️⃣ Best Practices and Pitfalls 2️⃣ Real-Life Examples 3️⃣ Profile Data Structure push-based.io/article/adva... by @michael-hladky.bsky.social #WebPerf #Performance #Node #JavaScript

🕵️‍♀️ CSS Contain and Content Visibility github.com/push-based/c... by @michael-hladky.bsky.social #WebPerf #CSS #Performance

New percentiles() method in WebPerf Snippets LoAF Helpers! Get P50, P75, P95, P99 stats for Long Animation Frames - perfect for RUM reporting without sending all frame data webperf-snippets.nucliweb.net/Interaction/... #WebPerf #WebPerfSnippets #PerfTools #INP #LoAF #JavaScript

Hey @developer.chrome.com, time to print a new sticker for my laptop 😎💻

meet me in 15 minutes performanceobserver.dev/events/episo...

¿INP/LCP altos sin saber la causa? 😵‍💫 La nueva Long Animation Frames API (LoAF) te permite ver DENTRO de cada frame lento 🚀 Te enseño a usarla en vivo para cazar los scripts que arruinan la UX de tu web 🗓️ 30 Oct, 19:00 CET 🔗 www.meetup.com/es-ES/madrid... #WebPerf #INP #LoAF #JavaScript

📣 New WebPerf Snippet LoAF Helpers: Advanced Debugging in DevTools webperf-snippets.nucliweb.net/Interaction/... #WebPerf #PerfTools #Performance #LoAF #INP

Cooking up a new #WebPerf snippet using the Long Animation Frame (LoAF) API Great for debugging jank and improving smoothness! Stay tuned 👀 #Performance #PerfTools #CoreWebVitals #INP #LoAF

Cooking up a new #WebPerf snippet using the Long Animation Frame (LoAF) API Great for debugging jank and improving smoothness! Stay tuned 👀 #Performance #PerfTools #CoreWebVitals #INP #LoAF

📝 Importing vs fetching JSON JSON imports are now supported cross-browser, but when would you use them rather than fetch()? jakearchibald.com/2025/importi...

Google provides weekly performance data through the CrUX History API, based on the Chrome User Experience Report. Our test results now report the maximum 40 weeks of data available! www.debugbear.com/test/website...

✍️ New post: Adding AVIF and WebP Sup­port to My Craft CMS Site #blogtober #CraftCMS #webdev #images #performance matthiasott.com/notes/adding...

Image format comparison: JPEG vs. PNG vs. WEBP vs. AVIF Great deep-dive into how image formats stack up — JPEG, PNG, WebP & AVIF — comparing size, quality & compression efficiency. 📸📊 A must-read for designers & web devs! photutorial.com/image-format... #Image #Performance #ImagePerf

"When a user interacts with the page, those interactions should be as fast as possible" #WebPerf #Performance #INP #UX

We're currently working on devtools for view transitions in Firefox, but in the meantime, here's a little-known option that helps…

The free INP Debugger tries out a bunch of interactions on your website and measures their Interaction to Next Pant scores. And now it also reports scripts that delay interactions, using the Long Animation Frames API! www.debugbear.com/inp-debugger

After three years attending @perfnow.nl in person — the leading conference in the Web Performance community — this year I’ll be joining online. Huge thanks to the organizers for building such an inspiring community, full of talent, inclusion, collaboration, and friendship! #WebPerf #Perfnow