Jonathan Kemp

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More importantly, you should not assume that the performance of your application on Simulator is the same as it would be on the device. Simulator is essentially running your iOS application as a “guest” Mac OS X application. As such, it has a 4 GB memory partition and swap space available to it as it runs on a processor that is more powerful than the one on the device.
Cocoa Fundamentals Guide: What Is Cocoa?