The biggest problem I had with iOS 11 on the Air 2 was dropped frames. It could be anything and the tablet suddenly struggles to render the fancy effects of iOS, which irritated the hell out of me. iOS 12 fixed 90% of that (it still happens rarely).
Another problem was the speed of my iPad. iOS 11.4 definitely slowed down my Air 2 and I regretted updating from 9.3.5. iOS 12 sped everything up from 11, which is nice.
Also, I feel like my iPad can hold more apps in memory without killing them. I would notice a lot of app reloads and safari tab reloads on 11 which annoyed me. I still notice a few too many safari tab reloads on 12, though.
Games are good too now. I like to play Minecraft a lot, as well as some other heavy games. They all would lag on iOS 11, but now they run fine on 12.
Another problem was the speed of my iPad. iOS 11.4 definitely slowed down my Air 2 and I regretted updating from 9.3.5. iOS 12 sped everything up from 11, which is nice.
Also, I feel like my iPad can hold more apps in memory without killing them. I would notice a lot of app reloads and safari tab reloads on 11 which annoyed me. I still notice a few too many safari tab reloads on 12, though.
Games are good too now. I like to play Minecraft a lot, as well as some other heavy games. They all would lag on iOS 11, but now they run fine on 12.
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