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I wonder if this is less a result of a newer OS, and more a result of the reported slowing of the CPU, due to a bad/old battery. Try replacing the battery and seeing if that speeds things up

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Battery throttling was introduced somewhere in the iOS 11.x series; 10 didn't do it.

First of all, this iPad was almost untouched for years, she only got it to use this one particular presentation software, so it was in near mint condition.

Secondly, I've seen this happen to other iOS devices, in a clear progression.

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