Even after restarting and letting it settle, I've got two cores spinning.
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Yeah beta 2 was ok. TBH I think the best battery was latest prod.I downgraded to 10.0.2 via option+update, but my phone is all spazzed out. Luckily there is the Activity Decipher tool. Restoring as new to 10.0.2 now. What a mess.
Clearly something wrong with beta 3, as I've heard nothing but good things about beta 2.