My iPhone 4S came back with 2 cores consistently. It took ~25 seconds each time. If the goal is to find the sweat spot for an algorithm, wouldn't it be best to

My iPhone 4S came back with 2 cores consistently. It took ~25 seconds each time. If the goal is to find the sweat spot for an algorithm, wouldn't it be best to ran several small tests of the specific algorithm with different optimization values?