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Somewhere in the documentation they mentioned 400 Hz. Nice figure, but I end up getting something less than 100. Even on the latest, coolest, most awesome iPhone 4. And I’m not doing anything except incrementing a counter (ivar) and assigning the value to a label. Can’t imagine this is the bottleneck.
I set the frequency to the maximum possible (very small number, like 1.0/10000). It is supposed to be capped to the max whatever the hardware supports.
You can adjust that frequency – see my answer.