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performanceVercel

Network Latency Budgets

MUST

MUST: Mutations (`POST/PATCH/DELETE`) target <500 ms

POST/PATCH/DELETE operations complete in under 500ms

Bad

Good

Why it matters

Users expect mutations (create, update, delete) to feel instant. Target 500ms or less for these operations. Use optimistic updates, show loading states immediately, and optimize backend performance to meet this budget.

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.