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performanceRauno

Pause Off-Screen Videos

MUST

MUST: Do not autoplay every video at once — observe visibility with `IntersectionObserver` and pause (or unmount) off-screen videos; iOS chokes otherwise.

Auto-playing too many videos chokes the device — pause or unmount off-screen videos

Bad

Good

Why it matters

Each playing video consumes CPU and GPU resources. On mobile devices especially, having multiple videos playing simultaneously can cause the device to lag, overheat, and drain battery. Use IntersectionObserver to only play videos visible in the viewport.

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.