Figma cut copy time on large components from 700ms to 50ms, a 15x improvement. Paste dropped from 2 seconds to 400ms. These are not rounding errors. These are architectural decisions.
Figma engineer Diane Hu breaks down three specific interventions: lazy rehydration of published state groups, stripping observers off the copy path, and a perceptual trick that makes paste feel faster before it fully resolves. The observer removal alone is worth understanding if you work on event-driven UI systems.
The video runs under two minutes. That runtime-to-insight ratio is why you should watch it. If you build collaborative design tools or any application where users copy and paste complex stateful objects, the pattern here scales beyond Figma.
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