iiinova — where your digital self keeps evolving

Tim Kadlec @tkadlec.bsky.social · 16/07/2026

❤️ Day made. (We have _gotta_ find time to hang out again)

120

Tim Kadlec @tkadlec.bsky.social · 16/07/2026

not sure what you're even referring to jason it's the stage lighting

120

Tim Kadlec @tkadlec.bsky.social · 15/07/2026

My talk from last year's @perfnow.nl is now out. Come for the dad jokes & advice on how to troll your kids, stay for my thoughts on stubborn empathy for our users as the foundation for web perf & two threats to the web: the monoculture and the machine. www.youtube.com/watch?v=Dvpi...

youtube.com

Stubborn Empathy - Tim Kadlec - performance.now() 2025

YouTube video by Web Conferences Amsterdam

3153

Tim Kadlec @tkadlec.bsky.social · 06/07/2026

Took long enough to make it happen! :)

010

Tim Kadlec @tkadlec.bsky.social · 06/06/2026

Sorry I missed this! Let me do some digging. Feels like a super fun one to dive back into.

120

Tim Kadlec @tkadlec.bsky.social · 26/05/2026

Mine too. I'm getting increasingly annoyed by the concept that I need to change the way I write because the machines steal similar patterns.

140

Tim Kadlec @tkadlec.bsky.social · 18/05/2026

📝 New post: Losing Focus timkadlec.com/remembers/20... Expressing some concerns I have about how all the AI-buzz is causing our industry to lose focus on what matters: the actual human beings using what we build.

2162

Tim Kadlec @tkadlec.bsky.social · 17/05/2026

Been awhile since I dug, but yes, last I looked it was nearly a guarantee that if a site was an SPA, there was likely at least one notable memory leak.

182

Tim Kadlec @tkadlec.bsky.social · 04/05/2026

I wrote "Your Voice" in 2016 to encourage people new to speaking & writing to be yourself, to find what's authentic for you and make sure you let that shine through in what you create. Seeing so many social posts and blog posts clearly written by AI—it feels more important today than 10 years ago.

timkadlec.com

Your Voice - Web Performance Consulting | TimKadlec.com

1103

Tim Kadlec @tkadlec.bsky.social · 17/04/2026

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.

0309

Reposted by Tim Kadlec

Patrick Meenan @patmeenan.com · 17/04/2026

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

043

Tim Kadlec @tkadlec.bsky.social · 27/03/2026

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

050

Tim Kadlec @tkadlec.bsky.social · 26/03/2026

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?

69442

Tim Kadlec @tkadlec.bsky.social · 20/03/2026

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.

060

Tim Kadlec @tkadlec.bsky.social · 11/03/2026

blocked and reported as making me feel old

040

Tim Kadlec @tkadlec.bsky.social · 05/03/2026

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.

070

Tim Kadlec @tkadlec.bsky.social · 28/01/2026

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?

002

Tim Kadlec @tkadlec.bsky.social · 26/01/2026

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.

2160

Tim Kadlec @tkadlec.bsky.social · 14/01/2026

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

020

Tim Kadlec @tkadlec.bsky.social · 08/01/2026

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

1252

Tim Kadlec @tkadlec.bsky.social · 12/12/2025

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.

0153

Tim Kadlec @tkadlec.bsky.social · 07/11/2025

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

030

Tim Kadlec @tkadlec.bsky.social · 07/11/2025

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

010

Reposted by Tim Kadlec

Sergey Chernyshev @sergeyche.dev · 06/11/2025

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.

091

Tim Kadlec @tkadlec.bsky.social · 02/11/2025

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

110

Tim Kadlec @tkadlec.bsky.social · 01/11/2025

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

200

Tim Kadlec @tkadlec.bsky.social · 01/11/2025

I am so sincerely sorry for what I have done.

100

Tim Kadlec @tkadlec.bsky.social · 01/11/2025

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

120

Tim Kadlec @tkadlec.bsky.social · 01/11/2025

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. ;)

020

Tim Kadlec @tkadlec.bsky.social · 01/11/2025

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.

0140

Reposted by Tim Kadlec

performance.now() conference @perfnow.nl · 01/11/2025

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

0277

Tim Kadlec @tkadlec.bsky.social · 31/10/2025

Thanks, Philip. :) Will get it merged.

000

Tim Kadlec @tkadlec.bsky.social · 31/10/2025

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

120

Tim Kadlec @tkadlec.bsky.social · 31/10/2025

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

1243

Tim Kadlec @tkadlec.bsky.social · 31/10/2025

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!

github.com

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.

5385

Tim Kadlec @tkadlec.bsky.social · 31/10/2025

I have been sooooo looking forward to this! SPA heuristics are gonna be such a huge step forward for measuring perf on the web and finally having hard data on the perf impact. @mmocny.com #perfnow

Michal Mocney presenting at perfnow about SPA heuristics, demoing being able to measure LCP and other metrics on soft navigations

0132

Reposted by Tim Kadlec

Stoyan Stefanov @stoyan.me · 30/10/2025

Fellow #perfnow fellows, a reminder that PerfPlanet calendar is coming this December for another edition. And it needs YOU. Please ask if you have any contribution ideas or concerns calendar.perfplanet.com/contribute/

calendar.perfplanet.com

Contribute

Passionate about a topic? Working on a new tool? Have a technique you want to teach? Research you've done? Tell the web performance community! Send your articles to ssttoo@ymail.com. Please include: ...

22319

Reposted by Tim Kadlec

Phil Hawksworth @philhawksworth.dev · 30/10/2025

“We should treat accessibility as something that is structural or baked in or part of the DNA, if we want to be successful” — says @marcysutton.com at #perfnow “Don’t treat it like trying to put chocolate chips into a cookie after it is baked” I love this framing!

1469

Tim Kadlec @tkadlec.bsky.social · 30/10/2025

@inesakrap.bsky.social starting her #perfnow talk with Lego's and Bluey has me already a fan.

082

Reposted by Tim Kadlec

Tammy Everts 🍁 @tammyeverts.com · 30/10/2025

Slides from my @perfnow.nl talk — How Fast Is Fast Enough? — are up! If you’re at #PerfNow (or even if you’re not) I’d love to talk about creating a delightful experience for your users. speakerdeck.com/tammyeverts/...

speakerdeck.com

How Fast Is Fast Enough? [PerfNow 2025]

It sounds like a simple question, but if you've been working in web performance long enough, you know the answer is far from straightforward. In this ke…

0116

Reposted by Tim Kadlec

Estela Franco @guaca.bsky.social · 30/10/2025

Friendly reminder! #perfnow

Harry on the stage. Behind him, a slide that reads as follows:

"While a good TTFB doesn't necessarily mean you will have a fast website, a bad TTFB almost certainly guarantees a slow one."
— csswz.it/ttfb

172

Reposted by Tim Kadlec

Vinai Kopp @vinai.bsky.social · 30/10/2025

@tammyeverts.com opening #perfnow with How fast is fast enough? #pragmagical

092