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performanceVercel

Large Lists

MUST

MUST: Virtualize large lists (eg, `virtua`)

Virtualize large lists or use content-visibility

Bad

Good

Why it matters

Rendering thousands of DOM nodes causes performance issues. Use virtualization libraries that only render visible items, or use CSS content-visibility: auto to let the browser skip rendering off-screen content.

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.