Watch the Week 1: Using the Metronome to Build Speed online guitar lesson by Scott Allen from Rock Chops
Here we'll learn how to properly use the metronome to develop not only speed, but control at any tempo. The key to this is to start slowly with any example you use and incrementally up the tempo. It is important to have high standards and make sure that you never increase the speed until you have total control over what you are playing. Remember it doesn't do us any good to play fast and sloppy, we want fast and clean. To make that happen, the metronome is your best friend.