Tim Kadlec

@tkadlec.bsky.social

3886 Followers 179 Following

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

Michal Mocney presenting at perfnow about SPA heuristics, demoing being able to measure LCP and other metrics on soft navigations
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Chrome's performance timline, showing a 3.99s long task caused by a script injected by the 1Password Chrome Extension.
Annie Sullivan on stage at perfnow, with a slide showing the cycle of change - measure - learn
This image shows the LCP metric from two page loads (same page, same location, same connection, same device). One is 1.96s, the other is 10.08s. The difference is a third-party provider who was having server issues, causing their script to take 9.5s to load.
Screenshot from Treo showing INP on mobile for the past year. There's a massive jump in INP performance in May, followed by another big one in June. INP went from 89.8% poor in April to 9% poor in June.
The heading of the image says "Same event, same selectors, with and without jQuery's :last" Under it shows two flame charts from Chrome. One takes 616ms and is the click event with :last in the selector list. The other takes only 16ms. It's the exact same event, but with :last removed.