In 2023 I published WebPerf Snippets as a website, with snippets to paste into the DevTools console

Version 2.0 is also built for AI agents: every snippet returns the same structured result, so an agent reads data instead of console logs

webperf-snippets.net

🧵 #WebPerf #AI

Si estás en la @BiznagaFest y quieres un sticker de webperf-snippets.net búscame ☺️

#BiznagaFest26 #WebPerfSnippets

Tip: Switch Claude Code's output style to Concise to get short, straight-to-the-point results.

Enable it via /config → Output style, or add "outputStyle": "Concise" directly to your settings.json.

You can still get the full details when you ask.

Looks like my work on WebKit's speculation rules support is *finally* available in Safari 27.3

JPEG XL Integration to Firefox completed

12+ years of hard work and beautiful dreams of a faster and nicer looking internet for all

connect.mozilla.org/t5/ideas/suppo…

Chrome @googlechrome now measures soft navigations in the @ChromeUXReport.

Once they’re counted, the share of app-heavy sites with good loading scores on Android goes from 26% to 87%.

Will your web app’s scores change? 👇

#WebPerf

💙¡Últimos ponentes de a11yConf 2026!

🌳 El árbol de accesibilidad frágil: por qué el HTML semántico es clave para el rendimiento web
🎙️ @nucliweb

¿Sabías que el HTML semántico no solo ayuda a crear experiencias más accesibles, sino también a hacer nuestras webs más rápidas?

Another WebGPU and WGSL exploration. The theme of this one is watercolor and how to make it an interactive experience for you in a computer. 🎨✨ Check it out at watercolor.bizar.ro.

Estás tirando tokens a la basura con tus agentes y ni te estás enterando.

Hacer 20 llamadas seguidas a APIs para filtrar 3 datos satura el contexto, dispara la latencia y te infla la factura.

La alternativa es Code Mode: que el modelo escriba el script, lo ejecute en un sandbox ue necesitas.

En datos es de locos:
- De 22 steps a 2.
- De 200 KB en contexto a 1 KB.

Dentro vídeo explicándolo en profundidad👇

If you ever struggled with understanding if your CSS performance issues are coming from style calculation or from layout, LoAF's styleDuration and layoutDuration is shipping in Chromium 158 to help with that groups.google.com/a/chromium.org…

⚡Featured posts this week:
✨ Todays PHP Security Release: @ThePHPF
✨ Shopify Checkout Hijack Attack: @romanzipp
✨ AI, make the website good: @zachleat
✨ Whats new in the W3C WDS: @studio24
🙏 Special thanks to the authors!
#webperf

Experimental soft navigation data now available in CrUX!!

If your site is an SPA then see how your own Core Web Vitals data will change at: cruxvis.withgoogle.com

And read this blog post for more details about how Core Web Vitals change in general:

web.dev/blog/crux-expe…

Since March I’ve been building tools with Claude to understand my own tumor. Now Anthropic is supporting it with $30,000 in credits 🥹

I wrote everything I built. What I need now is someone who can make a personalized vaccine, and a hospital that can give it 💜 👇

We have presents for you! 🎁

- A new WebMCP Skill with best practices for security, development, & consequential flows

- WebMCP Types: TypeScript definitions, with type inference from InputSchema

Give em to your agent, it helps scaffold out WebMCP so fresh and so clean clean

🎉 WebPerformance Report Week #42 is out! ✅

Join our growing community:
⚡ Performance Report
🛡️ Security Report
♿ Accessibility Report
📊 Analytic Report
🔎 SEO Report

Explore our report catalog
👉 webperformancereport.com/#Catalog

#webperf #websecurity #a11y #analytics #seo #ai

From population models to personalized AI!

How can we build digital twins tailored to individuals?

Join #GDGGirona on Oct 22 for a live demo exploring generative deep learning, transfer learning & personalized healthcare

👉 gdg.community.dev/events/details…

#AI #MachineLearning

Also new: 17 interactive demos, the browser support of each snippet, and a DevTools extension in beta.

webperf-snippets.net/extension

And a new domain: webperf-snippets.net

If you try it, I'd like to hear what's missing