Earlier quoted context omitted.
Hmm I would beg to differ. I have some N7s and they are too slow to even run as a panel for home assistant. Apps have really got much heavier since then. Of course they are running only a mid-range SoC from 2012 so that makes sense.
From what I've read, it's mostly a battery issue (the battery is so dead the CPU gets heavily throttled).
I always do this when I use tablets as wall panels, because eventually the battery will bloat and possibly catches fire. This way I can remove the battery altogether. None of the tablets and phones I have tested are capable of even starting up on USB power alone: With a dead battery or removed battery they simply won't even power on.