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by forrestthewoods 1289 days ago
> The performance improvement they’re showing is great -17% CPU to display a loading animation down to 0.

It’s not reducing the device CPU cost to zero. It’s moving it to a different process that isn’t captured in the profile. Big difference.

Not blocking the main thread is a clear win though. I’m mildly surprised the work isn’t done in an in-process background thread. But I don’t know that type of detail for iOS.