This is from Total Guitar Magazine (UK) from (I think from memory) the December 2003 issue..
Apparently they used one of those programs that slows down CD's so they could count the number of notes being played per second.
Here is the list and I must say I was a bit surprised at some of the positions and omissions...
"10. Steve Morse
Steve once played 14 notes per second in the song "Tumeni Notes" from
the album "High Tension Wires".
9. Marty Friedman
Marty once played 15 notes per second in "Ashes in your Mouth" from the
album "Countdown".
8. Yngwie Malmsteen