I am currently on iPad Air 2, ios 10.2. I can't remember when this started happening, but I think since a while ago I have been experiencing intermittent, momentary lags in apps. For most apps, this is not really a big issue, but I use my iPad mostly for these rhythm/music games, where even a moment's lag or stuttering really interferes with the enjoyment of the game. I know iPad Air 2's hardware is powerful enough to handle the particular games I am playing. I suspect it might have to do with the apps not being perfectly optimized for iOS 10.2, but I am kind of ruling that out too because the very same games run smoothly without such lags on my iPhone 7 plus, also on iOS 10.2. And yes, I know iphone 7 plus has more powerful hardware, including more ram, than ipad air 2, but I really don't think it's the hardware that's at fault for my issue. The games used to run smoothly without a hitch on the same iPad Air 2 when it was on ios 8, and I think they used to run smoothly even on ios 10.2 for the first little while. And no, I can't use iphone 7 plus to play these games be ause iphone 7 plus' screen is too small and I can play on iphone 7 plus only using bluetooth earphones (which has delays, which will be fatal for rhythm/music games where perfect sync between sound and screen is absolutely critically important). I tried everything that comes up through google search - reboot, turn off icloud, turn off background app refresh, turn off location services, turn on reduced motion and turn off parallax, turned off auto brihtness, there's enough free storage space on my ipad air 2 (more than 10gb), close all other apps when I am playing these games, freed the memory by holding power button and then. Home button, turned off siri suggestion, turned off automatic download/upadates from appstore, etc, changed email setting to manual fetching, turned off most notifications from most apps. In other words, I disabled every feature I could possibly disable, to the point of reducing my ipad air 2 to a fraction of what it can potentially do. I still experience these occassional "spike"-like lags in my games. I think my only remaining option is to do a factory reset. My question is, if I back up my ipad and do a factory reset, then restore my ipad using the backup, will it also simply restore whatever that might be causing my issue? Should I instead manually recreate my old configuration after factory resetting the device? Also, I am on ios 10.2 and want to stay on it, in case I want to jailbreak. Can I do. Factory reset without updating the ios version? Thank you for reading such a long post. Help would be really appreciated.