Hello there, I have an iPad 2 I never upgraded past iOS 6.1.3, and while it's running beautifully and I jailbroke it (for f-lux), most new apps are now incompatible. I mostly still use Snow Leopard as an OS, and I already know using iTunes to upgrade iOS to the 9.x branch will prevent any future synchronization ability between iTunes and the iOS 9.x. But on Apple forums, it says that upgrading OTA to 9.1 keeps sync ability with iTunes in SL. So, I'd like to know what to expect if I upgrade older hardware to iOS 9.3.3 (current version). Apps will be compatible, sure, but what about the overall speed? I get the feeling that each new iOS version slows down older hardware. Will it stay compatible with iTunes on SL?