Site-Speed That Sticks
summary
Practical playbook and hard numbers: a five‑step performance framework from project definition through deployment, with concrete tools and tests you can run. Use Chrome Performance panel live metrics and custom throttling copied from WebPageTest, simulate latency by sleeping the dev server or using slow files, treat synthetic tests as back‑stop not monitoring, set a budget equal to the worst value in the last release, use trip wires (e.g. bundle >60 KB → INP >200 ms), and codify rollback rules (example: KPI >100% for 1 hour → immediate rollback).
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