basically defiler plays at 13-13.5 notes per second (13.33333333..... to be exact) on chromatic runs, which is pretty fast but not impossible.

Me, I am playing 16ths at 120 bpm, which is considerably slower!

i think jason becker played serrana (sweeping piece that sounds pretty damn fast) at 140 bpm, at 6 notes per beat, which is 14 notes per second. But then, maybe other guys can play faster than that. I myself can sweep at 100bpm

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