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A comment on If your iPhone is slow, try replacing the battery. Parent comment

Re:If your iPhone is slow, try replacing the battery by exikyut on Sunday December 10, 2017 @12:01AM (#15890020)
Solely from a performance analysis standpoint, you've just perfectly described something using 100% CPU across all cores.

But you aren't reporting the phone being warm to the touch, so... hm.

Have you tried wiping and restoring it?

It could be interesting to back it up, wipe it (and maybe remove the SIM card for completeness?), install the worst performing apps on the fresh install, and _then_ (maybe wipe again(?), then) restore it back to normal.

If app performance is terrible in the fully-wiped state, I'd take the phone into an apple store (regardless of warranty status) just to see what they say.

Hmm. Just thought of this: maybe your battery is like the OP's from reddit but in really bad condition, and your phone is downclocking itself to compensate?

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Re:If your iPhone is slow, try replacing the battery by exikyut on Sunday December 10, 2017 @06:02AM (#15890898)
Was randomly browsing elsewhere and stumbled on https://news.ycombinator.com/item?id=15627880

Adding this to my comment because it's relevant

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Re:If your iPhone is slow, try replacing the battery by diogenescynic on Sunday December 10, 2017 @06:09PM (#15894000)
My iPhone 6s Plus gets extremely hot, battery life sucks, camera doesn’t focus, and apps are not responsive. Whenever I’ve brought it to an Apple store they said there are no issues...
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