Overview
Performance work is usually 90% measurement and 10% changes. Get the measurements right and the fixes are mostly obvious. Get them wrong and you spend weeks tuning things that nobody notices.
Highlights
- Lead with the Core Web Vitals — LCP, INP, and CLS — instead of synthetic scores
- Optimize the largest paint element first; it usually drags the rest of the page with it
- Add a perf budget to CI so regressions block merges instead of shipping silently
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