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Vinicius Dallacqua

@webx.bsky.social
967 followers 205 following 202 posts

Into browsers and agentic systems. Engineering QA.tech Building agent.perflab.io Into film photography and web performance nerd.

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Reposted by Vinicius Dallacqua
Barry Pollard @tunetheweb.com · 23/06/2026
It's happening... We've asked Chromium API owners for permission to ship The Soft Navigation work to allow measuring of Core Web Vitals for SPAs!!
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Paul Kinlan @paul.kinlan.me · 01/05/2026
I'm pretty certain that web mcp has the opportunity to be everything that I wanted web intents to be and it's only possible since the invention of llms aifoc.us/webmcp-is-th...
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Vinicius Dallacqua @webx.bsky.social · 13/04/2026
The harness uses Gemini 3.0 Flash end-to-end btw.
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Vinicius Dallacqua @webx.bsky.social · 13/04/2026
I had my agent browsing around @nearestnabors.com comics and using the exposed tools to find me recommendations to read. @developer.chrome.com have done something amazing here and I can't wait for more sites to have it available.
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Vinicius Dallacqua @webx.bsky.social · 13/04/2026
WebMCP is a great new spec and I've been playing around with it in my own implementation into my web browsing agent harness. It brings interactions to a fraction of the time and sessions get faster and also 'cheaper' for the models.
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Reposted by Vinicius Dallacqua
Alex Russell @infrequently.org · 11/04/2026
This React -> Web Components post by the MDN team touches on challenges and solutions I've seen dozens of times over frontend's lost decade. Kudos to them for the improvements in performance, and the bravery to tell the story in an unvarnished way: developer.mozilla.org/en-US/blog/m...
developer.mozilla.org
Under the hood of MDN's new frontend | MDN Blog
You may have spotted that MDN has a new frontend. There's plenty happening under the surface, so let's unpack the technologies we chose, the architectural decisions we made, and why we did a rebuild…
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Vinicius Dallacqua @webx.bsky.social · 13/03/2026
@developer.chrome.com is building something amazing here! And, the harness built with agent-browser is so effective that the chat, browsing agent and WebMCP agent are using @developers.google.com Gemini 3 Flash. Here's a demo video of the agent I'm building with that stack: youtu.be/QsV0Wb1ezHg
youtu.be
Neuve Browsing Agent
YouTube video by That Perf Guy
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Vinicius Dallacqua @webx.bsky.social · 13/03/2026
Tthe baseline for the browsing agent I've built can navigate around and perform tasks for me but takes several turns, spends more tokens and takes more time. After implementing WebMCP into the harness, tasks that took several turns became instant (for pages that exposes the features)
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Vinicius Dallacqua @webx.bsky.social · 13/03/2026
I've been playing with building a personal assistant meets browsing assistant for mobile web and had to experiment with WebMCP as part of the experience. It's amazing to see the experience when the browsing agent performs tasks instantly instead of wasting turns to perform a task.
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Reposted by Vinicius Dallacqua
rich harris @rich-harris.dev · 10/03/2026
myth: LLM-assisted coding means everyone is forced to use The Popular Framework forever reality: agents will happily migrate your entire app to The Good Framework inertia is a powerful drug but we are entering a world without moats, plan accordingly strawberrybrowser.com/blog/react-t...
strawberrybrowser.com
How we Rewrote 130K Lines from React to Svelte in Two Weeks
We ported Strawberry's entire frontend from React to Svelte in two weeks using coding agents. It made the browser 2x faster.
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Joan León @nucliweb.net · 10/03/2026
When a Skill activates, its SKILL.md loads into context. The webperf-loading was 24 KB, most of it unnecessary to decide which script to run I applied progressive disclosure and brought it down to 11 KB #WebPerf #Performance #AI #AIAgent #AIPerf
Table titled “Results” showing reductions in JavaScript bundle sizes for web performance features. Columns: Skill, Before, After, and Reduction.
	•	webperf-loading: 24,199 B → 11,149 B (−54%)
	•	webperf-core-web-vitals: 13,890 B → 10,266 B (−26%)
	•	webperf-interaction: 17,143 B → 12,443 B (−27%)
	•	webperf-media: 13,273 B → 12,017 B (−9%)
	•	webperf-resources: 11,700 B → 11,026 B (−6%)
	•	Total L2: 82,916 B → 59,612 B (−28%)

The table highlights overall bundle size reduction after optimization.
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Reposted by Vinicius Dallacqua
Max Novem @maxnovem.art · 17/02/2026
I talk often about breaking out of walled gardens, that you don't have to be on corporate-web in order to be on the web. This is a fantastic article about the problem and how to (pretty easily) fight it. Well worth reading. Also, @strange.website is a rad human being. henry.codes/writing/a-we...
henry.codes
A Website To End All Websites | Henry From Online
How to win the war for the soul of the internet, and build the Web We Want.
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Vinicius Dallacqua @webx.bsky.social · 10/02/2026
Using Opus 4.5 I turned Claude Code and agent-browser into my personal AI lab and triggered differernt sub-agents and 'co-workers' to independently explore in a sandbox the best way to converge into a good set of guardrails, tools and CoT prompt autonomously Full article here dev.to/viniciusdall...
dev.to
Agents That Build Agents — Building Autonomous Browsing with Claude Code
Agents That Build and Improve Agents — Building Autonomous Browsing with Claude...
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Vinicius Dallacqua @webx.bsky.social · 10/02/2026
They converged on similar patterns I've seen other browsing agents use under the hood. But some of the findings and the process I took taught me quite a lot. On the YT link you can see an early experiment of this browsing agent with Kernel.sh as the CDP session provider youtu.be/yzzec2KFI7c
kernel.sh
Kernel: Browser infrastructure for web agents and automations
Browser infrastructure for AI agents and web automations. Anti-bot detection, reusable sessions, fast spin-up, and autoscaling browsers.
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Vinicius Dallacqua @webx.bsky.social · 10/02/2026
Instead, I carefully created an experiment on the problem. No shared context, no instructions and no specific method in mind and let them figure out how to drive a browsing session based on a goal independently.
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Vinicius Dallacqua @webx.bsky.social · 10/02/2026
I have a 'neuve' side project and I'll start writting more about it here. This time the writeup brings some of my experience when developing the browsing aspect of, I stopped telling AI agents what to build.
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Vinicius Dallacqua @webx.bsky.social · 30/01/2026
I've actually used the learnings on how to compress trace information into a more token efficient format in a custom pipeline using Firecrawls's response (MD representation of a web page) into something more efficient, I'm calling CMD (Compressed Markdown DSL), but that's a writeup for another time.
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Vinicius Dallacqua @webx.bsky.social · 30/01/2026
I've written about my journey building PerfAgent and my learnigns on DevTools source code on last year's PerfCalendar: calendar.perfplanet.com/2025/teachin...
calendar.perfplanet.com
Teaching Agents about Performance insights
AI is kinda everywhere! Everyone is shipping AI features or Agents, but few of those systems can reason about the complex reality of performance data. This session is a deep dive story into the jour...
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Vinicius Dallacqua @webx.bsky.social · 30/01/2026
What a banger of an article developer.chrome.com/blog/designi... Great job by the @developer.chrome.com team and as someone who has been very deep into the codebase and actually saw the evolution written in this article, and extracted it to build PerfAgent
developer.chrome.com
Designing DevTools: Efficient token usage in AI assistance  |  Blog  |  Chrome for Developers
Learn how the Chrome Tooling team optimized token usage for AI assistance, and discover techniques for more efficient data usage with LLMs.
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Reposted by Vinicius Dallacqua
Brandon Dail @brandondail.com · 27/01/2026
Here's your friendly reminder that CSS selectors are global and evaluated RTL, so if you have selectors that are very broad like `.container > div` you might be impacting performance in a measurable way 🙈 Before and after profile of server switching after some selector optimizations in @discord.com
Two screenshots from Chrome DevTools side-by-side. On the left it says "Before" and shows that rendering took 1518 milliseconds. On the right it says "After" and shows that rendering took 610 milliseconds.
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Vinicius Dallacqua @webx.bsky.social · 31/12/2025
Wrapping up the year with my article for the Perf Calendar with my write up about how I ended up creating agent.perflab.io! It has AI, it has Perf…what else could you want 😎🔥 I’m always happy to see my content in the Performance Calendar! Thanks for the initiative @stoyan.me !
agent.perflab.io
PerfAgent - AI-Powered Web Performance Analysis
Get expert insights on Core Web Vitals and performance optimization from an AI specialized in web performance analysis.
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Reposted by Vinicius Dallacqua
Joan León @nucliweb.net · 07/11/2025
My gist “How Browsers Work” has been updated with a new post: “How modern browsers work” by @addyosmani.bsky.social gist.github.com/nucliweb/c16... #WebPerf #Browser #WebDevelopment
gist.github.com
How Browsers Work
How Browsers Work. GitHub Gist: instantly share code, notes, and snippets.
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Vinicius Dallacqua @webx.bsky.social · 06/11/2025
Here are my slisdes too 🫡 docs.google.com/presentation...
docs.google.com
Teaching Agents about Performance Insights
DEMO STARTS Teaching Agents about Performance Insights
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Reposted by Vinicius Dallacqua
Alex Russell @infrequently.org · 31/10/2025
No lies detected.
A link to join the web perf slack at performance.now()
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Reposted by Vinicius Dallacqua
Rick Viscomi @rviscomi.dev · 17/10/2025
Quite the journey!
Summary of the dns-prefetch feature, showing support first landing in Safari 5 (June 2010), then Chrome 46 (October 2015), then Edge 79 (January 2020), Firefox 127 (June 2024), and finally Safari 26 for iOS (September 2025)
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Vinicius Dallacqua @webx.bsky.social · 21/10/2025
I’m super hyped and happy to announce that I’m getting even deeper into helping agents reason about software quality as I join QA.tech! Since I’ve started working on PerfLab and then PerfAgent this has become an obsession. Now I get to do that full-time and I could not be more thrilled!
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Vinicius Dallacqua @webx.bsky.social · 20/10/2025
Having done the same mistake I can say that it is a lesson learned.
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Ivan Akulov @iamakulov.com · 20/10/2025
something very cool to see: Chrome recently shipped automatic <link rel="prefetch"> for all links in viewport you could do it previously with libs like Quicklink, but it’s super cool to see this implemented natively (it’s off by default, enabled with one html tag)
Screenshot of a table titled “Proposed plan”, showing some updates to speculative rules, from the doc linked in the next post
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Vinicius Dallacqua @webx.bsky.social · 20/09/2025
Wrapping up the writting part for my talk at @perfnow.nl this weekend and I'm beyond excited for this one. Prepare for a deep dive folks!
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Reposted by Vinicius Dallacqua
Henri Helvetica 🧑🏾‍🚀🇭🇹 @henrihelvetica.bsky.social · 11/09/2025
✨SPDY STREAM 010 ✨ with Jacob Groß 📢 As mentioned during yesterday's stream, Jacob is our next guest, and we shall cover tag mgmt and the deleterious effect they can have on performance, esp web vitals and possible solutions. Join us! 📆 Wednesday Sept 17th ⏰ 1PM EDT 🔗 bit.ly/spdy-stream-010
bit.ly
SPDY STREAM with Jacob Groß 🇩🇪
In this episode, we are joined by Jacob Groß to discuss tag managers and their often detrimental effect on website performance. We will explore how tag managers can impact performance in a multitude o...
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Vinicius Dallacqua @webx.bsky.social · 05/09/2025
I'm also open for consuntancy, so reach out if you are looking to collaborate. I've been building v0.perflab.io agent.perflab.io and other cool stuff, with V0 SDK, AISDK and Mastra Also have interest on browsers and DevTools with my own projects and forks of it to ship my own autonomous agents.
v0.perflab.io
V0 MCP Server
Model Context Protocol (MCP) server that exposes v0.dev APIs through the Streamable HTTP pattern. Built with Hono framework and deployed on Vercel.
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Vinicius Dallacqua @webx.bsky.social · 05/09/2025
Am currently trying to get my own thing off the ground prototyping an intersection of browsers and personal assistants and also autonomous coding agents that are capable of self improving. Hit me up know if you know of any oportunities around 🫡
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Vinicius Dallacqua @webx.bsky.social · 05/09/2025
Hello everyone, I have just heard that the company I'm a lead engineer for is going to downsize so I'm going to look for the next thing from next week. I'm looking to work with AI engineering and am shipping lots of different code automations and agent workflows.
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Vinicius Dallacqua @webx.bsky.social · 04/09/2025
I'm beyond excited to share a stage with so many great names! This is a special event to me and I'm super hyped to share a bit of my story with you all ❤️
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Barry Pollard @tunetheweb.com · 02/09/2025
Really excited to be speaking @perfnow.nl this year—my favourite conference run by some of my favourite people! If you're into web performance (or wanna be!) and like a great conference with a super friendly vibe then pop along to Amsterdam at the end of October. Tickets selling fast! perfnow.nl
perfnow.nl
performance.now(); 30th and 31st of October, Amsterdam
On 30th and 31st of October, 2025, the sixth edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.
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MCP Developers Summit @mcpdevsummit.ai · 29/08/2025
Google’s @jackf.io is speaking at the London MCP Dev Summit 🎤 Topic: Lessons learned building the Chrome DevTools MCP Server 👉 Don’t miss it: buff.ly/MwmiH5E (early bird pricing ends in 2 days!) #MCPservers #DevToolsAI
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Vinicius Dallacqua @webx.bsky.social · 26/08/2025
Whist trying out my demo for the Agentic Perf Analysis and Debugging, I managed to use my V0 and my DevTools MCP servers to debug one of my V0 demo chats. Using animation frame insights no less 😃
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gilbertococchi @gilbertococchi.bsky.social · 25/08/2025
performance.now() is coming to Amsterdam this October! This event is great both for the inspirational talks as well as for the opportunity to meet folks from different companies and backgrounds to discuss how to successfully tackle web performance challenges!
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ppk 🇪🇺 @quirksmode.org · 25/08/2025
performance.now(), the web performance conference, 30th and 31st of October, Amsterdam. Single track, the best speakers in the industry, plenty of your performance-mad peers around to have fascinating conversations. What's not to like? perfnow.nl
perfnow.nl
performance.now(); 30th and 31st of October, Amsterdam
On 30th and 31st of October, 2025, the sixth edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.
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Reposted by Vinicius Dallacqua
JSNation @jsnation.gitnation.org · 12/08/2025
Gain insights from @webx.bsky.social at the past conference talk on #AnimationFrames, #INP, and #LoAF APIs for responsive web applications! #webdev gitnation.com/contents/what-is-an-a…
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Vinicius Dallacqua @webx.bsky.social · 08/08/2025
We're almost there! After spending the week hacking OAuth support into Mastra MCP client class and getting the toolcall aproval workflow to an MVP state this sprint is soon coming to an end.
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Vinicius Dallacqua @webx.bsky.social · 05/08/2025
This will be lots of fun. get ready to see how @developer.chrome.com can help you leverage AI to fix problems, but also get a glimpse of how AI native DevTools can look like 👀 Tune in live here: gdg.community.dev/events/detai...
gdg.community.dev
Real Problems, Real Tools: AI &amp; Web Performance | Google Developer Groups
Virtual Event - Join us for the first-ever GDG Web Stockholm event — a brand-new chapter focused on the future of web development!This o...
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Vinicius Dallacqua @webx.bsky.social · 30/07/2025
I've seen and am following the great work being done by the @chromium.social team on new primitives for browsers, and am experimenting with my own forks of DevTools and Chromium. I'm exciteed for what's to come, and believe that the platform will thrive!
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Vinicius Dallacqua @webx.bsky.social · 30/07/2025
There's a larger goal of mine here, my experiments with MCP is to try to better understand how to enable good primitives for AI native systems.
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Vinicius Dallacqua @webx.bsky.social · 30/07/2025
PerfAgent will be a web MCP client fully spec compliant. Great playground for this. After getting the spec compliance, I'll move to MCP UI and then we'll start having fun.
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Vinicius Dallacqua @webx.bsky.social · 30/07/2025
I've managed to implement OAuth into Mastra MCP client (on a fork of mine) and now it talks to my V0 remote MCP server (that uses OAuth). Gotta work on the HITL parts of the MCP tool call as the spec requests, but we're moving now 😎.
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Vinicius Dallacqua @webx.bsky.social · 30/07/2025
I've started to implement the client using Mastra MCP client, since I already use Mastra as my agent framework with AI SDK. But Mastra supports only setting the auth header, and do not (at this time) support the full OAuth flow. Good thing is, I've been playing lots with OAuth flow for MCP servers
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Vinicius Dallacqua @webx.bsky.social · 30/07/2025
Updates on PerfAgent, after spending some time implementing v0.perflab.io MCP server it's now time to create PerfAgent's MCP client. It will be a great way to expose the agent to external services and agents such as @sentry.io Seer, and my own servers too, like V0.
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Vinicius Dallacqua @webx.bsky.social · 21/07/2025
Thanks 😁😁
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Vinicius Dallacqua @webx.bsky.social · 21/07/2025
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