Fastest not cam, fastest your technique + spring setup. For me black (default) is the best for most situations. Sometimes i use blue. It dependence on what type of music you play and what type of technique you use.
Paul Daluz for i had the same problem, i use the black cam to improve my control. When you have good control, try the smaller cams. That takes a looot of hours hiting the pedals,as the friend has told above.
