Speed
Coming soon to the site is Improvising Study 9. In this lesson I'll teach you how to approach Speed Playing. Take one chorus of a songs you know how to play well and speed it up 10% using a program like the Amazing Slowdowner. Work on that until you can play it well at that speed. Keep doing this until the passage is played at lightning speed.
A TIP: Playing with a relaxed embouchure (tongue, lips, jaw as well as any other muscles that might tense up... like neck, shoulders and back). Muscle tension inhibits speed.