I just downgraded my brother's iphone 4 to ios 4.3.5 and (settings app is an obsession of mine) I noticed that the settings app opens really fast, in ios 5 it opens slower and in ios 6 it opens almost as fast as ios 4. Now, is it just me or apple makes old iphones slower with these updates? like when I press the home button from camera app to homescreen, it lags a lot on ios 6 and ios 5.1.1 but on ios 5.0.1 and ios 4 it is pretty silky smooth.