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performanceVercel

Device/Browser Matrix

SHOULD

SHOULD: Test iOS Low Power Mode and macOS Safari

Test iOS Low Power Mode and macOS Safari

Bad

Good

Why it matters

Performance varies dramatically across devices and browsers. iOS Low Power Mode throttles animations and JavaScript. Safari has different behavior than Chrome. Test on real devices, not just desktop browsers.

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.