iPod Touch 4G，iOS 5上的最大（实用）内存使用

We have a memory-intensive 3D app which is primarily targeted at iPad 2 and iPhone 4S, but it works on iPod Touch 4G and iPhone 3GS as well. We have found that the smaller memory footprint on the iPod Touch 4G, combined with the retina display, makes this platform more susceptible to out-of-memory errors. iOS5 also seems to have lowered the available memory somewhat.We have a memory-intensive 3D app which is prim