Hi, My mother's iPad mini 2 still is on iOS 8.3, because she doesn't need anything more than what it offers. She doesn't want me to change her "workflow". However, given that the upgrading window to iOS 9 is close to expire, I'm considering the possibility of update. How is the iPad mini 2 on iOS 9.3.4 compared to iOS 8 from the performance viewpoint? Thank you.