CrUX data isn't 28 days old. It's two days old
What takes 28 days is for the window to fully turn over, and that's why p75 sits still for two weeks and then drops all at once
I wrote about it, with two interactive demos
joanleon.dev/en/crux-28-day…#WebPerf#CoreWebVitals#CrUX
A letter from @addyosmani landed in my mailbox today, thanking me for my work on Agent Skills. I got in through web performance and stayed for the rest.
Thinking about contributing to open source? Start small. Docs and honest reviews count.
github.com/addyosmani/age…
Web/Product Performance is a marathon, not a sprint.
You can ship the fastest version of your site today. Two weeks later: a new third-party script, an unoptimised image, a CDN config change. The speed is gone and nobody noticed. 🧵
#WebPerf#RUM#CoreWebVitals
Opening @ChromeDevTools's Performance panel for the first time is overwhelming: two axes, a wall of color, hundreds of stacked frames
So I built an interactive guide to learn to read it, from the waterfall and flame chart to LCP, CLS and INP
perf.reviews/profile-guide#WebPerf