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performanceVercel

Throttle When Profiling

MUST

MUST: Profile with CPU/network throttling

Test with CPU and network throttling

Bad

Good

Why it matters

Developer machines are faster than average user devices. Use browser DevTools to throttle CPU (4x slowdown) and network (Fast 3G) to test how your app performs for users on slower devices and connections.

References

Built by Gleb Stroganov, design engineer at Evil Martians.

The rules come from other people's skills and guidelines — Vercel, Rauno Freiberg, @Ibelick, impeccable, Emil Kowalski, Tailwind, RAMS — each one credited on the Sources page. The work here is extraction and wiring: every rule is pulled into one corpus, given a good and a bad example you can operate, a MUST/SHOULD/NEVER rule an agent can paste, and a link back to where it came from.