[oger]

How come that the MASSIVE slowdown of my iPhone 6s occurred after upgrading to iOS11? TBH the spin that Apple is sending out to make us believe that this was all a clever implementation (which it still might be) does not match with the reality that iOS 11 was creating the slowdown of a device that was working 'fine' before. And yes - this 6s is eligible for the battery replacement program and the Geekbench scores also indicate that this device has an issue. tl;dr: it seems that this is not the only explanation of the slowdown. Any thoughts?

[unreal37]

You can see that a LOT more devices were affected on iOS 11. I assume they tweaked the algorithm as to when it's triggered.

https://www.geekbench.com/blog/2017/12/iphone-performance-an...

[nyolfen]

did you upgrade from a version prior to 10.2? apparently that was when this was implemented

[thinkythought]

I had this issue, restore it and set it up "as a new phone" then manually reinstall your apps. the backup-restore process introduces all kinds of crappy issues