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Core Web Vitals: What Cloudflare's BEACON Data Says to Fix First

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I have a bad habit with performance work. I open Lighthouse, see a red number, and start fixing whatever the report lists first. Usually that's an image that's 40KB too big. It feels productive, and it moves the score, and half the time it has nothing to do with what my client's users actually wait for. So when Cloudflare released a dataset of real-user measurements from about 10,000 of the biggest sites on its network, I read the BEACON announcement with a specific question: if I had one afternoon to improve Core Web Vitals on a normal client site, where should it go?

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