Vinicius Dallacqua

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.

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...

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...

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.

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

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.

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

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 !

How Browsers Work How Browsers Work. GitHub Gist: instantly share code, notes, and snippets.

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

Teaching Agents about Performance Insights DEMO STARTS Teaching Agents about Performance Insights

Here are my slisdes too 🫡

docs.google.com/presentation...

A link to join the web perf slack at performance.now()

No lies detected.

Quite the journey!

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!

Having done the same mistake I can say that it is a lesson learned.

Screenshot of a table titled “Proposed plan”, showing some updates to speculative rules, from the doc linked in the next post

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)

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!

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...

✨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

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.

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.

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 🫡

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.

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 ❤️

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.

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

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

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 😃

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!

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.

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?

https://perfnow.nl/

Gain insights from @webx.bsky.social at the past conference talk on #AnimationFrames, #INP, and #LoAF APIs for responsive web applications! #webdev
https://gitnation.com/contents/what-is-an-animationframe-and-what-can-it-tell-you

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.

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...

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...

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!

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.

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.

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 😎.