As far as the fastest, I would have to say Paul Gilbert before he wussed out and joined Mr. Big. Definitely faster than Yngwie, and I like Yngwie. Listen to some of Gilbert's work when he was with Racer X. However, what Gilbert has in terms of speed he lacks in terms of feeling. That Racer X crap is about as sterile as a Doctor's hands before a major operation. That may be something that is incident to shredding. Gilbert's playing is so fast that I think I had a seizure listening to it one day.