I don’t think there’s any difference between the beta and the final release in this regard (generally, the official release has the same build number than the latest release candidate).

From what I understand, the process can take a lot of time, as it happens in the background, when the phone is not actively used. And for power users that install .0 versions day one (which is really not a thing to do, but that’s not the point here), I imagine they will dig everything they can from these new versions, leaving less time for background processes to be run.