Hi. I have the first iPad Air with iOS 7.1.2. I also owned the original iPad and when I upgraded that one, it became slow and useless. That's why I decided to not upgrade my iPad Air 1. However, some apps I want now requires iOS 8, so I am considering upgrading to iOS 9 (since the automatic installer in Settings takes the newest update, I guess I must upgrade to 9 instead of 8). My question: is it worth it? Will my iPad Air become slow? Will it crash a lot due to RAM limitations? Thanks in advance.