any1 who has a low performance or lags on the ios mobile version should try this :
i'ts a low setting from iphone 4 with everything turned off (and near drawing distance lowered)
along with this :
that lowers the far drawing distance, my game runs pretty smooth on my ios 5.1.1
it is very important that you play in SAFE MODE (with no junk lurking in the background)
it gives the biggest fps boost!
hope it helped, have a great holidays and a great new year!