I have a 4S and I love it but it has become increasingly slower since I got it. When I say slow I mean in regard to responsiveness, launching and loading apps, processing requests/buttons pressed etc. I don't know if this is due to software upgrades, although I havent upgraded past iOS 5.01. I have cleared all of my text conversations and am only using 5 GB of the 32. I only have 2 pages of apps and none of them are in folders. Would I notice a dramatic improvement in performance speed with 5?