As we sat down today to do some performance profiling in Shark, we came to a sudden realization - it doesn't work anymore with iOS4. After some quick Google searching I came across a thread in Apple's developer forum (registration required) that indicated there were no plans to bring iOS4 support to Shark.

Here was the problem: we were working on an OpenGL iPhone game and for some reason the frame rates were unusually low - especially for what little action was happening on the screen at the time. My first plan of attack was to begin commenting out chunks of the system in an attempt to see what module was causing the problem. I removed the physics, the logic updates, and some of the things being rendered. Nothing I did, however, seemed to create a noticeable improvement in performance.

The video tutorial below shows how to use the performance tools that come with the Apple development kit to find memory leaks in Cocoa and Cocoa Touch code.