Arima is right, Apple recommands to not go more than 20 mb or 20%, not sure, if i'm not wrong, but in reality, it seems that you can use more :
170-180mb of ram on devices with 512 Mb of ram total (iPhone 4, iPad 2, iPod touch 4g)
40-80mb of ram on devices that have 256 MB of ram (iPad, iPhone 3gs, iPod touch 3g)
25 MB on device with only 128MB of ram (IPhone 3g, iPhone 2g, iPod touch 1g-2g)
found here, not official at all : http://stackoverflow.com/questions/6044147/memory-limit-and-ios-memory-allocation-in-iphone-sdk
but in general, it's what appears to be possible. (i saw the same kind of returns in lot of websites).
And as long as it's impossible to escape the fact that all the game (and so all the use of ram, if i understood well too) is load at the begining of the game (can't wait cocoonJs to support the loading of each layout), it's a thing you have to really be carreful of, to my opinion :)
ps : thanks for your words about my english, i try to do my best :)goldentreee2013-04-26 01:10:27