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Reposted by Barry Pollard

Firefox Performance @firefoxperformance.bsky.social · 1h

Firefox 144 now supports INP! 🦊

We just shipped interactionId, the piece that makes Interaction to Next Paint work. It helps browsers connect events from the same interaction and measure how responsive pages really feel.

More here: blog.mozilla.org/performance/...

Firefox 144 ships interactionId for INP – Mozilla Performance

TL;DR Firefox 144 ships PerformanceEventTiming.interactionId, which lets browsers and tools group events that belong to the same user interaction. This property is used to calculate Interaction to Nex...

blog.mozilla.org

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Barry Pollard @tunetheweb.com · 2h

But remember that webperf is about UX, not for speed alone.

The fastest page is plain text. But that's pretty boring and not very engaging. Everything we add will slow down the page but if it improves it then that's worthwhile.

The key is finding the balance. And 70ms for VTs seems OK to me. YMMV

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Barry Pollard @tunetheweb.com · 2h

Yes we've looked at this before and 1 or two frames is expected. Which makes 70ms delay at the top end of what I'd expect, but interesting to see that was what was observed in RUM.

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Reposted by Barry Pollard

erwinhofman.bsky.social @erwinhofman.bsky.social · 6h

Nerdy stuff! @mozilla.org #Firefox just enabled support for #INP with v144 🎉

I dived into our raw RUMvision data. And yep, can confirm that it works when using Google's web-vitals #JavaScript library 😍

(updated) article + chart + baseline badges in a blogpost:
www.rumvision.com/blog/firefox...

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Reposted by Barry Pollard

Dave Karpf @davekarpf.bsky.social · 18h

Everyone agrees that we're currently in a dotcom era-like AI bubble. People disagree what sort of bubble it is.

There are 3 stories one can tell about the dotcom crash: a startup story, a telecom story, and an accounting fraud story.

My take: it's giving Enron
open.substack.com/pub/davekarp...

It's Giving Enron

On the AI bubble, and the various echoes of the dotcom crash

open.substack.com

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Reposted by Barry Pollard

Cloudflare @cloudflare.social · 18h

Cloudflare investigated performance benchmark results for Workers, uncovering and fixing issues, making Workers faster for all customers.

https://blog.cloudflare.com/unpacking-cloudflare-workers-cpu-performance-benchmarks/

Unpacking Cloudflare Workers CPU Performance Benchmarks

Cloudflare investigated CPU performance benchmark results for Workers, uncovering and fixing issues in infrastructure, V8 garbage collection, and OpenNext optimizations. These improvements have made C...

blog.cloudflare.com

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Barry Pollard @tunetheweb.com · 18h

Seems like just yesterday this was a new thing...

Still not seeing enough sites using it though. Was worried I'd be sick of view transition effects by now with everyone doing it, but actually the opposite is true — a little disappointed it's not used more to be honest!

Una Kravets @una.im · 19h

View transitions are in every browser now ✨

Ollie Williams @ollie-williams.bsky.social · 23h

Firefox now supports view transitions, the command and commandfor HTML attributes, and the moveBefore() method.

www.firefox.com/en-US/firefo...

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Barry Pollard @tunetheweb.com · 21h

That's all for this month. Keep fast out there!

🏁 7/7 FIN

that 's all folks is written on a red and blue background

Alt: that 's all folks is written on a red and blue background

media.tenor.com

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Barry Pollard @tunetheweb.com · 21h

We hope to see these two Core Web Vitals become supported across all browsers as part of Interop 2025.

web.dev/blog/interop...

6/7

Interop 2025: another year of web platform improvements | Blog | web.dev

Discover the features included in Interop 2025.

web.dev

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Barry Pollard @tunetheweb.com · 21h

We want to congratulate @firefox.com and @firefoxperformance.bsky.social for shipping the Event Timing API in Firefox 144, meaning both INP (which is calculated from Event Timing) and LCP (that they shipped previously) can be measured in that browser. More Core Web Vitals for all!

5/7

Firefox now supports PerformanceEventTiming.interactionId, allowing developers to group related input events. This enables support for the Interaction to Next Paint (INP) responsiveness metric.

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Barry Pollard @tunetheweb.com · 21h

Community shout outs this month go to:

@tamethebots.com who created a CrUX MCP server (heads up, that we were already looking to add this to Chrome DevTools MCP server so keep an eye out for that in the near future!).

bsky.app/profile/tame...

4/7

Dave Smart @tamethebots.com · 1d

This now supports both the CrUX API and the CrUX History API, so you can now ask questions like

"What are the CWV trends like for example.com on desktop and mobile, across the whole site?"

Dave Smart @tamethebots.com · 13d

MCP Server fever! Following on from the robots.txt MCP server release of yesterday, today I've launched one for you web perf fans!

Query the CrUX API in your favorite AI tool

Example: youtu.be/et7Og7_Ii6E?...

Get the details here: tamethebots.com/tools/cwv-hi...

#WebPerf #CWV #CoreWebVitals

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Barry Pollard @tunetheweb.com · 21h

A reminder that we are deprecating the CrUX Dashboard at the end of November. This will be the last month we are planning on updating the data in the CrUX Connector that powers this dashboard and any similar dashboards you may have created based on this.

developer.chrome.com/blog/crux-da...

3/7

CrUX Dashboard deprecation | Blog | Chrome for Developers

We're planning on deprecating the CrUX Dashboard after the end of November 2025. CrUX Vis is a newer tool that visualizes historical CrUX data that has many advantages over the older CrUX Dashboar...

developer.chrome.com

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Barry Pollard @tunetheweb.com · 21h

Here's a look at origins' Core Web Vitals performance this month:

66.8% of origins (↑ 0.5%) had good LCP
80.1% of origins (~ 0.0%) had good CLS
86.0% of origins (↑ 0.3%) had good INP
53.7% of origins (↑ 0.5%) had good LCP, CLS and INP

2/7

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Barry Pollard @tunetheweb.com · 21h

🆕 The 202509 Chrome User Experience (CrUX) release is now live on BigQuery!

Check out the announcement post for the full info:
groups.google.com/a/chromium.o...

Highlights below 👇

🧵 1/7

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Reposted by Barry Pollard

Piccalilli @piccalil.li · 1d

It's here. JavaScript for Everyone is now available to…everyone!

The amount of effort and experience packed into this course is unbelievable and we know you're going to love it.

Get yours for £189, down from £249, for 2 weeks and super-charge your career prospects

piccalilli.link/js4e-launch-...

JavaScript for Everyone

A high quality, expansive written course that will elevate your JavaScript skills to a level you never thought was achievable.

piccalilli.link

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Reposted by Barry Pollard

CSS by T. Afif @css-only.dev · 1d

It's also easy to debug using @developer.chrome.com

It shows you which fallback position is used by crossing out all the others. When all of them are crossed out, the position defined on the element is the one used.

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Reposted by Barry Pollard

Brecht De Ruyte @utilitybend.com · 2d

🚀As a case study, I tried to recreate the famous Guess Who game with built-in AI and the Prompt API. It was a really interesting experience, to say the least.
My heart is at CSS & UI, and always will be. However, I do love to experiment with a variety of (web)technologies 😄 Read all about it

Build a guessing game with the Prompt API | Blog | Chrome for Developers

My game of Guess Who demonstrates how AI can be used to build thoughtful game logic, and the importance of prompt engineering to get the outcomes you expect.

developer.chrome.com

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Reposted by Barry Pollard

Una Kravets @una.im · 1d

The #CSSPodcast is back! 💕🎙️

Join @bram.us and I this season as we talk about a bunch of awesome new CSS features, starting with custom functions and if()

thecsspodcast.libsyn.com/92-css-if-an...

The CSS Podcast: 92: CSS if() and custom functions

Welcome back to the new season of the CSS Podcast, where Una and Bramus are your guides, your cohosts, and your CSS best friends. In this episode we dig into two very powerful new CSS features: inlin...

thecsspodcast.libsyn.com

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Barry Pollard @tunetheweb.com · 1d

Pretty sure “beer” is a metaphor for 99% of other products having AI forced on them here and this whole story is a metaphor…

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Barry Pollard @tunetheweb.com · 1d

Great post from the folks @debugbear.com on the new DevTools MCP server and how you can use it for performance debugging:

DebugBear @debugbear.com · 1d

MCP servers act as the connection between AI models and other software.

Our new article explains how you can use the Chrome DevTools MCP to debug web performance issues.

www.debugbear.com/blog/chrome-...

Performance Debugging With The Chrome DevTools MCP Server | DebugBear

Learn how to use the Chrome DevTools MCP server with AI models to analyze web performance and get concrete optimization recommendations.

www.debugbear.com

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Reposted by Barry Pollard

Matthias Ott @matthiasott.com · 2d

✍️ New post: The Lifeblood of the Web

Because conferences are just 🔥🎉💙

#blogtober #web #conferences #community
matthiasott.com/notes/the-li...

The Lifeblood of the Web · Matthias Ott

Matthias Ott is an independent user experience designer and web design engineer from Stuttgart, Germany. He also teaches Interface Prototyping at the Muthesius Academy of Fine Arts and Design.

matthiasott.com

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Reposted by Barry Pollard

performance.now() conference @perfnow.nl · 2d

OK, we're down to our last tickets. There's still room for people to join performance.now() on 30th and 31st of October (in two weeks and a bit), but it's time to decide.

perfnow.nl
Last tickets at perfnow-2025.eventstack.shop

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.

perfnow.nl

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Barry Pollard @tunetheweb.com · 3d

Ah Enron really were quite innovative in this sort of thing. It could be argued there was kind of a use for this. Like if you can do it for energy…

CDO squared however was something else. I think I even remember CDO cubed being talked about back in my JP days before it all came tumbling down.

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Barry Pollard @tunetheweb.com · 3d

“Those who cannot remember the past are condemned to repeat it.” George Santayana

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Barry Pollard @tunetheweb.com · 3d

“These companies offered their services or products for free or at a discount with the expectation that they could build enough brand awareness to charge profitable rates for their services in the future.”

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