Alot of musicians re rather intimidated by scales, because sometimes it can turn into such a competition when playing or listening to others. To generate speed, first make sure that you can play the scales (which ever one you desire) at a normal speed, set your mind and everything else should fall into place. Also to play much faster and much more smoothly, don't hold the pick so darn hard...stay loose. Ideally you'll want to practice as many scales as possible (major, minor, pentatonic, blues, modal, etc...) If you feel you arent getting anywhere, perhaps its best to keep a logbook so you can chart your progress from day to day.

-Joseph :)