memory consumption ios

hi to all,

ive got a serious problem out there , actually i'm trying to find out how on the hell with an empty scene i get around 200m~350m of memory taken ..i've got several levels in my game , assets are not in Resources directory, assets are prefabs who are instantiate in each level. i mean that's a problem because i ve got an out of memory error from xcode...of course loading a level get me from 300m to 500-600m .... any ideas ? the build size on Ios is about 412mo is this possible that everything is already preloaded in memory ?? hope not ...