I'm very excited about this! Have seen some really significant impact in our tests. With the sizes of websites and JS payloads continuing to increase, this is both important and impactful.

Really excited to see the support for compression dictionaries that @cloudflare.social is working on. Great background on the feature as well.

Yes! I haven't written a blog post in a century but I threw together a draft on one about exactly this last night.

p75 and p90 JavaScript bytes on the web have exploded since May, 2025—easily the largest 10 month period based on HTTP Archive data since 2023.

The long-tail is getting worse, very quickly.

Gemini, what happened in May 2025?

Doing my part to keep customer support people employed and paid one annoying and frustrated "please let me talk to a real person and never make me use this useless AI support again" message at a time.

blocked and reported as making me feel old

Wow this is very, very good! @whitep4nth3r.com

The somewhat ironic part about all the backlog of code to review thanks to AI coding tools is that AI is _significantly_ better at code review than it is at code generation.

Live view of me waiting for this day...

Gonna be a lot of fun with some awesome stuff to come!

Do I know anyone, or does anyone I know know anyone, at eBay who I can chat with about some things I'm running into with their API's?

AI automated support bots are one of the worst plagues to infest the internet. They are truly awful, infuriating and useless 95% of the time.

Please, I am begging, just let me talk to a real person.

So far, AI has been considerably better at the illusion of utility and intelligence than at actual utility and intelligence.

AI will have to pry em dashes out of my cold dead hands

Interesting conversation I had with my kids recently: my high-school daughters actively avoid using "big" words in their writing because they get accused of using ChatGPT. Literally dumbing down their writing to avoid being accused of using AI

I do firmly believe that if you're an individual or company that is NOT over-indexing on AI right now, you have the competitive advantage.

Unfortunately I do not have high hopes that the industry will recognize that until significant damage has been done.

Will definitely be making sure it's available both as a CLI and something that can be deployed somewhere.

I heard you found them? :)

We're rewriting the Readme and that's definitely one of the changes in there. :)

Very happy to work on a tool like that with @tkadlec.bsky.social and the team!

Please try it out and post the issues and PRs.

this checks out

problem is will I actually remember this come this time next year?

Phew ok you've got me beat this time. I've got another ~6 hours left. :)

I am so sincerely sorry for what I have done.

So fantastic to see you, as always Tammy. :) Have a safe trip home.

Appreciate it!

Please feel free to add issues for features, improvements, bugs, etc as you go! Or if you're particularly ambitious and bored, PR's. ;)

At the airport heading back after another incredible #perfnow.

Each year, I'm reminded of how fortunate I am to be a part of the performance community. So many wonderful, kind, smart people all working together to make the web better.

Already looking forward to next year.

performance.now() 2026 will take place on 19th and 20th of November 2026. #perfnow.

Thanks, Philip. :)

Will get it merged.

just a couple old guys, yelling at things, us two

Always, always happy to see @yoav.ws get a shout-out. So much incredible work has happened because of him. Most recent example—speculation rules in WebKit. #perfnow

GitHub - cloudflare/telescope: Cross-browser web performance testing agent Cross-browser web performance testing agent. Contribute to cloudflare/telescope development by creating an account on GitHub.

Telescope, the new cross-browser performance testing agent I mentioned at #perfnow that we @cloudflare.social have open-sourced is here: github.com/cloudflare/t...

We want this to be a tool the entire community is able to contribute to and benefit from, so please help us make it better!

Stubborn Empathy by Tim Kadlec One of the most important roles we play on the web is as the users line of defense, which requires that we demonstrate stubborn empathy on their behalf. Unfortunately, that concept is all too easy to ...

I appreciate everyone at #perfnow letting me have my "old man yells at cloud" moment this morning.

Slides are now up: noti.st/tkadlec/3imH...