I suspect the stimulator does not perform exactly the same as the iPhone. Is that correct and what differences might I expect? In my case, I am testing the performance of streaming audio and video and the simulator reacts differently than a similar application on an iPhone. What baffles me is the two are virtually identical but they perform differently, unless I have made a mistake somewhere. Can you tell me more and what I should expect? Thanks.

There are many issues that can pop up on the device that never show on the simulator. What specific performance issues are you seeing? I have not seen many issues related to audio or video except the streams not loading correctly or taking too long to load and timing out. Do you have an iPhone to use for testing or have friends you can send ad hoc versions to? This might help to identify performance issues and whether or not it is a network problem or in your app.