Playing fast, eh?
I prefer to not play like slop. If your goal is to have flawless technique at high speeds, then I respect that. Don't leave out the low end while you're at it.
Anyways...An awesome exercise:
Know 'the spider?' Pick up the John Pattitucci instructional tape. If you are too lazy (or lack of funds) here it is:
Using economy fretting (one finger per fret):
G|---3---4---1---2---
D|-1---2---3---4-----
A|-------------------
E|-------------------
These are finger markings...Start off doing them higher up the neck (7th position,) until your comfortable with it.
Keep your fingers as close to the fretboard as possible. Minimize movement. The goal here is to produce a clear, precise tone, as effectively as possible. Also, keep your fingers arched. Remember a long time ago when you were taught how exactly how to play? Do that.
Start with quarters at 60 bpm. When you are comfortable. Bump it up ever so slowly. You might find you drop a bit each day, but don't sweat it. This is also an awesome warm-up exercise. You can play around with the pattern too (moving up and down strings or the neck, etc,) which will help moving and thinking whilst you play. If you want, you can start doing octaves across strings.
Did I miss anything?