lag when memory usage is only 45mb

birkules

hi everybody! when i tried my game on an iphone 4 it started to lag even if the total memory usage is between 38-45mb, and im still kinda early in the game so the total game file is only 6.6mb, so is that normal? it runs smooth on an iphone 5. and du you get better performance when you use ad hoc instead of the gs viewer on the phone? im asking cause i can`t make one and try now since the developer site is closed due to that hack. Any help would be much appreciated!