Joan León 🏞️⚡️

⚡️ Web Performance Artisan at @perfreviews_ | @GoogleDevExpert in #WebTech | @cloudinary Ambassador

[Joan León 🏞️⚡️ @nucliweb]

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

https://t.co/SxOhvywoSc

🧵 #WebPerf #AI

[Joan León 🏞️⚡️ @nucliweb]

How Modern Web Guidance modernizes your codebase, and why you should do it

https://t.co/ST6yV0urRj

[Paul Irish @paul_irish]

Need to record video of a Chrome tab, for a demo or tests?
There's a new API allowing flawless no-dropped-frames AV1 capture.

60fps easy. But can also do 120fps @2160p. (Yes, for real).

It's easy to use within pptr or playwright.. here's a mini npm package:
https://t.co/dvSxOa27vZ (bonus 120fps video within :)

[Joan León 🏞️⚡️ @nucliweb]

I love this project! 🤩

Creating QR codes has never been this fun. Such a cool and creative idea!

https://t.co/Kfxd10Y9oY

[Joan León 🏞️⚡️ @nucliweb]

Si estás en la @BiznagaFest y quieres un sticker de https://t.co/Pyhwmrv9Gd búscame ☺️

#BiznagaFest26 #WebPerfSnippets

[Joan León 🏞️⚡️ @nucliweb]

Dark mode = On

[Addy Osmani @addyosmani]

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.

[Yoav Weiss @yoavweiss]

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

[Jyrki Alakuijala 🇺🇦 @jyzg]

JPEG XL Integration to Firefox completed

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

https://t.co/BvIEEXM4JV

[WebPerformance Report @WebPerfReport]

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

[a11YConf @a11y_conf]

💙¡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?

[Luis Bizarro @LuisBizarro]

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 https://t.co/KyK52tkVEM.

[Carles Núñez Tomeo @carlesnunez]

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 y te devuelva solo lo que necesitas.

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

Dentro vídeo explicándolo en profundidad👇

[Addy Osmani @addyosmani]

https://t.co/1txsLAxxM5

[Addy Osmani @addyosmani]

https://t.co/4Hfk0dYIBI

[Yoav Weiss @yoavweiss]

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 https://t.co/dG4hKeOqGu

[WebPerformance Report @WebPerfReport]

⚡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

[Barry Pollard @tunetheweb]

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: https://t.co/IYa9CTdkyB

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

https://t.co/6pDl07j8IB

[Míriam González @miriamgonp]

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 💜 👇

[Sarah Drasner @sarah_edo]

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 @WebPerfReport]

🎉 WebPerformance Report Week #42 is out! ✅

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

Explore our report catalog
👉 https://t.co/nKDm5OL4A4

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

[GDGGirona @GDGGirona]

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

👉 https://t.co/rYnbPyODmv

#AI #MachineLearning