⚡️ Web Performance Artisan at @perfreviews_ | @GoogleDevExpert in #WebTech | @cloudinary Ambassador
Girona, Catalunya
Joined August 2008
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Joan León 🏞️⚡️ retweeted
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-experiment…
Joan León 🏞️⚡️ retweeted
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 💜 👇
Anthropic gave me $30,000 in Claude credits to research my own tumor I wrote what I built since March. I’m looking for someone who can manufacture a personalized vaccine, and a hospital that can give it
Joan León 🏞️⚡️ retweeted
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
ALT A sheet that talks about three tools for webmcp: the extension, webmcp types, and webmcp-skills
Joan León 🏞️⚡️ retweeted
🎉 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/#Ca…
#webperf #websecurity #a11y #analytics #seo #ai
Joan León 🏞️⚡️ retweeted
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/det…
#AI #MachineLearning
Joan León 🏞️⚡️ retweeted
Google's CrUX data now includes more nuanced Core Web Vitals metrics for single page apps!
You can check the new soft navigation metrics in our website speed test here: debugbear.com/test/website-s…
Joan León 🏞️⚡️ retweeted
The Split View API is here! Arriving in Chrome 155 and developed in close collaboration with Mozilla and browser vendors in the WebExtensions Community Group, this API integrates directly into the browser.tabs namespace without requiring any extra manifest permissions → goo.gle/47fdSOW
Joan León 🏞️⚡️ retweeted
🎉 WebPerformance Report Week #41 is out! ✅
Join our growing community:
⚡ Performance Report
🛡️ Security Report
♿ Accessibility Report
📊 Analytic Report
🔎 SEO Report
Explore our report catalog 👉 webperformancereport.com/#Ca…
#webperf #websecurity #a11y #analytics #seo #ai
ALT Five WebPerformance Report email examples showing web performance, accessibility, security, analytics and SEO reports on a colorful gradient background.
Joan León 🏞️⚡️ retweeted
⚡Featured posts this week:
✨ Improving site perf by shipping more CSS: @__joshblack
✨ How AI Agents Use Websites: @giacomozecchini
✨ Chasing the Perfect Website: Morgan Murrah
✨ Perf at Scale with Ryan Townsend: @RyanTownsend
🙏 Special thanks to the authors!
#webperf
ALT WebPerformance Report performance email preview highlighting optimization scores, Perf Links, and Core Web Vitals metrics on a colorful gradient background.
Joan León 🏞️⚡️ retweeted
The Technical Diagnostics and Business Outcomes Gap
When tools do not connect, people do.
And too often, senior specialists become human APIs between disconnected systems.
Full article in the comments 👇
#WebPerf #Data #Ecommerce
ALT Technical diagnostic signals and business outcome signals shown as two sides of the same website, separated by a gap in interpretation.
Joan León 🏞️⚡️ retweeted
Ep, vengo a dar un poco de autobombo a una idea que llevo un tiempo usando yo solo.
Trabajando en empresas donde el español no es la lengua principal, a veces pasa que, ya sea por falta de contexto o por diferencias culturales a la hora de expresarse, cuesta un poco entender a qué se está refiriendo un compañero cuando te explica algo o te da feedback.
Muchas veces hago follow-up y pregunto para asegurarme de no malinterpretar nada, pero otros días simplemente mi coco no da para más y acabo usando ChatGPT para que me diga por dónde van los tiros.
Así que hace un mes o así creé Entiendo.
Haces highlight de cualquier texto y puedes preguntarle rápidamente a GPT qué cree que quiere decir, si puede haber un segundo sentido o, si la conversación está escalando, cómo desescalarla.
Es 100% gratis, usa el sign-in de ChatGPT (dios les bendiga) y no guardo absolutamente nada de info de la conversación.
Está en castellano, inglés y catalán. Pero entiende cualquier idioma por el que pidais feedback.
Si la queréis probar:
madebysignal.dev/es/entiendo…
Joan León 🏞️⚡️ retweeted
DebugBear updates for September:
🏄 View Baseline feature support for your visitors
🛒 Ad performance metrics from Google's CrUX Report
📈 Even more customizable custom dashboards
debugbear.com/changelog/sept…
Joan León 🏞️⚡️ retweeted
La #GeeksCAT2026 ja és història, i quina història! ⚡
Sala plena a L'Estació Espai Jove, 10 ponències d'altíssim nivell tècnic, debats sans i retrobaments amb la comunitat tecnològica a Girona.
Obrim fil amb el resum i agraïments 👇🧵
#GeeksCAT #Girona
ALT Foto de grup de l'equip d'organització, suport i els 10 ponents de la GeeksCAT Conf 2026 somrient a l'escenari de L'Estació Espai Jove de Girona al final de la jornada.
Joan León 🏞️⚡️ retweeted
Una xarrada de @carlesnunez de rendiment, de les que li agraden al nostre company @nucliweb ☺️
#GeeksCat #GeeksCatConf
Joan León 🏞️⚡️ retweeted
We gave Claude Opus 5.5 an article we wrote a few months ago and asked it to turn it into an animation.👇
📖 The Anatomy of a Web Performance Report
calendar.perfplanet.com/2025…
Thanks for the idea, @addyosmani !
#AI #ClaudeAI #WebPerf
Joan León 🏞️⚡️ retweeted
Claude Opus 5.5 drew each frame of this animation in JavaScript. Here's "how browsers work" in 40 seconds.
Joan León 🏞️⚡️ retweeted
AI Reporting Workflow ✨
Turn one WebPerformance Report into:
→ UX & SEO Audits
→ Benchmarks
→ Cross-report correlations
→ Executive summaries
→ Tickets & tasks
→ And much more
WPR Report → AI → Insights → Action
Use ChatGPT, Claude, or Gemini.
Link in comments 👇
Joan León 🏞️⚡️ retweeted
🎇 I made a small Chrome extension: a side panel that drives any site's WebMCP tools with Jev!
When you type, on every keystroke it picks the relevant page's tool, fills in the arguments, and tells you how sure it is.
Here it is grocery shopping:
Joan León 🏞️⚡️ retweeted
Kodak images are old film based images with blur, film grain and lack of resolution. The corpus was then scanned from film to digital using the scanner technology from late 1980s or very early 1990s.
This is not a way to benchmark modern codecs.
If you compare with a high quality digital corpus you will get different numbers.