So i currently have an iPad 4 running iOS 6.1, and its pretty quick but I would like some better app compatibility, so i have been considering updating it to iOS 9. My concerns with updating are the crashing of safari and the device just getting slower overall. I do like iOS 6 on it, but I also am starting to think it may be time to update the iPad or upgrade to the Air 2 with the staples deal. So how does iOS 9 run on the iPad 4? And how is the battery life? Thanks for the replies and the help!