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Tim Kadlec

@tkadlec.bsky.social

Principal Product Manager @cloudflare—focused on performance and observability. Co-chair of https://perfnow.nl Taller than my photo looks.

3,680 Followers  |  171 Following  |  82 Posts  |  Joined: 24.04.2023  |  1.7716

Latest posts by tkadlec.bsky.social on Bluesky

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a man driving a car with the words where we 're going we don 't need on the bottom ALT: a man driving a car with the words where we 're going we don 't need on the bottom

Specs?

Where we're going, we don't _need_ specs.

02.07.2025 13:45 — 👍 1    🔁 0    💬 1    📌 0
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👀 Safari plans to ship LCP and INP in 2025?! Be still my beating heart. webkit.org/blog/16458/a...

02.07.2025 13:15 — 👍 5    🔁 0    💬 1    📌 0
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This is incredible data from @dbelson.com showing HTML requests from crawlers versus referrals from that platform. Very easy to see the cost of AI here.

ClaudeBot: 70.9k requests : 1 referral (!!!)
OpenAI: 1.6K : 1
Perplexity: 202.4 : 1
blog.cloudflare.com/ai-search-cr...

01.07.2025 15:30 — 👍 9    🔁 5    💬 0    📌 0

Pumped for this. The line-up is stacked (with more coming soon) & the community around the event has gotten better and better each year with amazing conversations throughout, side events, large standards & browser involvement—it's wild to think about how this has taken off from its 1st year.

26.06.2025 14:08 — 👍 7    🔁 2    💬 0    📌 0
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Lake Superior remains undefeated

22.06.2025 01:48 — 👍 22    🔁 0    💬 1    📌 0
Gerrit Code Review

For those of you who watched my talk at @webexpo.bsky.social, the bug I mentioned regarding speculation rules and GET/POST looks like it should be fixed in Chrome v138. chromium-review.googlesource.com/c/chromium/s...

h/t @tunetheweb.com

06.06.2025 12:53 — 👍 5    🔁 0    💬 0    📌 0

feel like that's a new bio pic everywhere possible

03.06.2025 19:13 — 👍 3    🔁 0    💬 0    📌 0

Likewise! :)

30.05.2025 23:07 — 👍 2    🔁 0    💬 1    📌 0

Got em!

So far....

30.05.2025 23:07 — 👍 2    🔁 0    💬 0    📌 0
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Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025] What do the most successful websites have in common? They’re all fast. Faster sites have happier users. Those happy users visit your site more often and…

Thanks again to everyone who came to my #WebExpo talk about the intersection of site speed, #UX and business metrics – and how to make a data-driven business case for investing in #webperf.

My slides are up. I'd love to hear your questions and feedback!

speakerdeck.com/tammyeverts/...

30.05.2025 08:11 — 👍 10    🔁 3    💬 0    📌 0

Heading home after a great #webexpo with a nice mix of old friends and new. Doesn't hurt that Prague is beautiful with ample dessert options. :)

30.05.2025 09:14 — 👍 10    🔁 0    💬 3    📌 0

Yay! Can't wait to see you again, Marcy!

30.05.2025 06:25 — 👍 2    🔁 0    💬 1    📌 0
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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.

I’m speaking at @perfnow.nl this October about Accessibility and Performance! Super looking forward to it. perfnow.nl/speakers.html

30.05.2025 06:01 — 👍 13    🔁 3    💬 1    📌 0

Well done! :)

27.05.2025 08:07 — 👍 1    🔁 0    💬 0    📌 0

It has arrived. I'm back in business.

I also now smell better.

26.05.2025 15:26 — 👍 2    🔁 0    💬 0    📌 0

Paris from the looks of it. :)

26.05.2025 13:47 — 👍 2    🔁 0    💬 1    📌 0
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Concur!

26.05.2025 09:55 — 👍 2    🔁 0    💬 0    📌 0

In all my years of flying, my luggage has been lost three times and three times only.

I have been to Prague three times and three times only.

The venn diagram is a full circle.

26.05.2025 06:36 — 👍 26    🔁 0    💬 4    📌 1

Agreed! If you're gonna use some sort of AI support, this is the way to do it.

Today, the AI chat bots are more often annoying than helpful. Need the escape valve.

09.04.2025 11:41 — 👍 1    🔁 0    💬 0    📌 0

Too real

09.04.2025 11:39 — 👍 1    🔁 0    💬 0    📌 0

Yeah we definitely need the "press 0" equivalent in AI chat bot land

09.04.2025 11:39 — 👍 0    🔁 0    💬 0    📌 0

I'm just a guy, sitting in front of his computer, begging companies to please stop making me talk to AI "support" and let me talk to an actual human being instead.

09.04.2025 02:27 — 👍 42    🔁 2    💬 4    📌 0

Who in their right mind says no to sun, web performance and cocktail?!

27.02.2025 13:12 — 👍 3    🔁 0    💬 2    📌 0

JEALOUS!

I mean, I am always up for sunny warm trips in the winter, so yes. :)

26.02.2025 20:42 — 👍 0    🔁 0    💬 1    📌 0

Yeah, dumb.

05.02.2025 16:11 — 👍 1    🔁 0    💬 0    📌 0

don't tell anyone

31.01.2025 21:52 — 👍 2    🔁 0    💬 1    📌 0
Chrome's performance timline, showing a 3.99s long task caused by a script injected by the 1Password Chrome Extension.

Chrome's performance timline, showing a 3.99s long task caused by a script injected by the 1Password Chrome Extension.

Screenshot showing the chunk of code (a mutation obsever) in the 1Password extension that seems to be the culprit.

Screenshot showing the chunk of code (a mutation obsever) in the 1Password extension that seems to be the culprit.

Been wondering why a bunch of sites have been SUPER slow lately.

Turns out it's the @1password.bsky.social chrome extension doing really bad things. :/

Gonna have to disable for awhile.

31.01.2025 20:28 — 👍 48    🔁 8    💬 5    📌 1

One thing about deadlifts: if you get sloppy with your form, you'll be _painfully_ aware of it.

This message has been brought to you by lower back pain.

07.01.2025 18:54 — 👍 12    🔁 0    💬 0    📌 0

Drinking plenty of mulled wine and watching Rudolph, as our forefathers intended.

25.12.2024 01:22 — 👍 11    🔁 0    💬 1    📌 0

This is so well deserved.

Not only is Pat one of the most brilliant people I've ever had the opportunity to work with, but he's so generous with his time—I wouldn't be able to do what I do without all the times over the years that Pat patiently answered my questions and helped me figure things out.

17.12.2024 13:42 — 👍 21    🔁 5    💬 0    📌 1

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