To shread good takes time and practice to achive, RESPECT to anybody who can blaste chromatic scale over 200 and who can sweep and skip from e to E. But of course it can get boring after a while. So you must compromise shred with feeling and melodies to get amazing solos. You can play faster than Randy (if you can), but don´t forget the slower parts ´cause it´s always those slower melodies that makes people say, hey that´s the solo I was talkin´ about our I heard that before somwhere. I mean I been listning to Yngwie for long time now and still can´t recognize some solos from eachother.

Check out Petruccis way of soloing god damn that man kicks ass. Zakk is fenomenal too.

PS. Check out live verision of Suicide Solution with Ozzy (Randy). It beats hell out Crowley and Crazy Train.