@nucliweb

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

 Girona, Catalunya
nucliweb.net
Joined August 2008
  • Tweets21.5K
  • Following4.3K
  • Followers12.1K
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Joan León 🏞️⚡️ retweeted
Barry Pollard@tunethewebOct 13
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…

CrUX Vis

CrUX Vis is a tool by the Chrome team to help you explore the Chrome User Experience Report (CrUX) data with visualizations and helpful links to articles, for a particular web page or origin.

cruxvis.withgoogle.com
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Joan León 🏞️⚡️ retweeted
Míriam González
@miriamgonpOct 18
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 💜 👇
Míriam González
@miriamgonpOct 18
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

Anthropic gave me $30,000 in Claude credits to research my own tumor. This is what I built.

Article · @miriamgonp
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Joan León 🏞️⚡️ retweeted
Sarah Drasner
@sarah_edoOct 19
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
A sheet that talks about three tools for webmcp: the extension, webmcp types, and webmcp-skills

ALT A sheet that talks about three tools for webmcp: the extension, webmcp types, and webmcp-skills

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Joan León 🏞️⚡️ retweeted
WebPerformance Report@WebPerfReportOct 18
🎉 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
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And a new domain: webperf-snippets.net If you try it, I'd like to hear what's missing

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.

webperf-snippets.net
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Also new: 17 interactive demos, the browser support of each snippet, and a DevTools extension in beta. webperf-snippets.net/extensi…

DevTools extension

A Chrome DevTools panel that runs the snippets on the inspected page and shows their results: the metric and its rating, the issues with how to fix them, and the items as a table. It runs the same...

webperf-snippets.net
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The CLI reaches 1.0: audit, loading and interaction workflows, CrUX data, and a GitHub Action with LCP and CLS budgets. `npx webperf-snippets example.com` webperf-snippets.net/CLI #CLI
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For agents: • A "Copy prompt" button next to the snippets, so an agent runs them with the CLI and reports back • Agent Skills for Claude Code, Gemini CLI and other agents • A Markdown version of every page, llms.txt and WebMCP tools #WebMCP #SKILLS
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That shared contract (status, value, rating, issues) is why this is a major version: if you read the output from code, some fields have changed. 56 snippets, 7 of them new: compression, Early Hints, Speculation Rules, third-party impact by domain, and more.
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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

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.

webperf-snippets.net
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Joan León 🏞️⚡️ retweeted
Matt Zeunert@mattzeunertOct 15
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…
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Joan León 🏞️⚡️ retweeted
Chrome for Developers
@ChromiumDevOct 14
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
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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

Entradas - a11yConf 2026

La conferencia de accesibilidad web más importante de España. Únete a profesionales, diseñadores y desarrolladores comprometidos con la inclusión digital.

2026.a11yconf.com
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Joan León 🏞️⚡️ retweeted
WebPerformance Report@WebPerfReportOct 11
🎉 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
Five WebPerformance Report email examples showing web performance, accessibility, security, analytics and SEO reports on a colorful gradient background.

ALT Five WebPerformance Report email examples showing web performance, accessibility, security, analytics and SEO reports on a colorful gradient background.

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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-impo… #JS #WebPerf

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,...

joanleon.dev
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Joan León 🏞️⚡️ retweeted
WebPerformance Report@WebPerfReportOct 4
⚡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
WebPerformance Report performance email preview highlighting optimization scores, Perf Links, and Core Web Vitals metrics on a colorful gradient background.

ALT WebPerformance Report performance email preview highlighting optimization scores, Perf Links, and Core Web Vitals metrics on a colorful gradient background.

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Joan León 🏞️⚡️ retweeted
WebPerformance Report@WebPerfReportOct 3
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
Technical diagnostic signals and business outcome signals shown as two sides of the same website, separated by a gap in interpretation.

ALT Technical diagnostic signals and business outcome signals shown as two sides of the same website, separated by a gap in interpretation.

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Joan León 🏞️⚡️ retweeted
Carles Núñez Tomeo
@carlesnunezOct 2
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…
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Joan León 🏞️⚡️ retweeted
Matt Zeunert@mattzeunertOct 2
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…

September 2026: Browser insights and CrUX ad metrics | DebugBear

A new Browsers tab with Baseline feature support, CrUX Ad Insights metrics and custom dashboard improvements.

debugbear.com
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One thing I’m experimenting with for a performance audit: Using RUM data + @debugbear MCP to build synthetic tests based on how the product is actually used RUM → real user behaviour → MCP → representative synthetic tests debugbear.com/docs/mcp #WebPerf #RUM #MCP

Access Web Performance Data With The DebugBear MCP Server | DebugBear

Connect AI assistants like Claude and ChatGPT to DebugBear using the Model Context Protocol (MCP) to run tests, query metrics, and manage projects.

debugbear.com
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