Decided to run a few performance tests on a game I'm writing, and noticed in the CPU test it says mach_msg_trap is taking up 88% of the CPU time. Had a google and found a couple of similar questions, but neither got a solid response. Is this normal? and if not, any ideas what could be causing it? I'm writing a game which runs on a timer, doubt it has much idle time between frames as I'm pushing the hardware (both cpu and the powervr) a fair bit.