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I have a 5S and iOS11 actually improved my phone's performance. The biggest hurdle for me was adjusting to the UI/UX changes. I actually had issues with iOS10

I have a 5S and iOS11 actually improved my phone's performance. The biggest hurdle for me was adjusting to the UI/UX changes. I actually had issues with iOS10 where my phone was consistently full no matter how much I removed from it. I had to remove almost everything to upgrade, but once I did it had cleared up most of the memory on my phone. The OS took up more space, but it seemed to have optimized whatever excesses were consuming everything before.

Joeri 9y ago
Were you on 10.3 before? The most likely explanation of what you saw is the APFS migration, but you should have already gotten that in the 10.3 update.
- 52-6F-62 9y ago
  Interesting point. I was, but not for very long. I was on 10.2 for the longest time. In the process of upgrading to 11, I upgraded to 10.3 for a few hours and didn't notice, but I didn't clear out as much from my phone until I moved to upgrade to 11, so I can't confirm one way or the other. I can say I've noticed an improvement in performance overall, though. And at the very least, it hasn't slowed down or run into any major bugs.