Joan León 🏞️⚡️

@nucliweb

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

Girona, Catalunya nucliweb.net Joined August 2008

4.3K Following 12K Followers 22K Posts

Latest posts 5

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Joan León 🏞️⚡️ @nucliweb Oct 16

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

webperf-snippets.net WebPerf Snippets Tested JavaScript snippets that measure and debug web performance. Your AI agent runs them for you, or you run them yourself in DevTools: the same code every time.

Joan León 🏞️⚡️ @nucliweb 1d

I love this project! 🤩

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

tree.icqr.com/s/MjJodHRwczov…

tree.icqr.com A Magic Tree was shared with you Open to see a beautiful 3D tree that hides a scannable QR code inside.

Joan León 🏞️⚡️ @nucliweb 3d

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

#BiznagaFest26 #WebPerfSnippets

Joan León 🏞️⚡️ @nucliweb Nov 20, 2025

Dark mode = On

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Joan León 🏞️⚡️ @nucliweb Oct 14

Es todo un lujo poder formar parte de @a11y_conf como ponente, donde hablaré de "El árbol de accesibilidad frágil: por qué el HTML semántico es clave para el rendimiento web"

🎟️ Aprovecha ahora que quedan entradas!!!

2026.a11yconf.com/entradas/

#a11y #WebPerf #a11yConf

2026.a11yconf.com Entradas - a11yConf 2026 La conferencia de accesibilidad web más importante de España. Únete a profesionales, diseñadores y desarrolladores comprometidos con la inclusión digital.

Joan León 🏞️⚡️ @nucliweb Oct 5

During a perf audit for a client, I read this in a PR: "The module should only be loaded once, not every time a file is selected." When I read it, something didn't add up, so I started digging. And the result surprised me.

I wrote a post joanleon.dev/en/dynamic-imp…

#JS #WebPerf

joanleon.dev Dynamic import(): the browser already caches our modules | Joan León Calling import() every time a feature is used doesn't download or evaluate the module again: the browser reuses it from its module map. What it guarantees, when the same module stops being the same,...