an old friend of mine I hav'nt seen in a while used to be able to fingerpick very quickly, he would use all 4 fingers, starting with his index and ending with his pinky, by the time he got to his pinky he already had his index finger ready for the next note.
he could keep up with a guitar's tremolo pick easy.

but he definatly most impressed me with his slap-pop sweeps and tapping.