The best tempo drill.....

Tee up 5 balls in a line, but not too close together. Your goal is to hit the 1st ball 50 yards with your driver, and increase the distance of each shot by 50 yards as you go down the line.

I don't mean hit it further than 50 yards, I mean hit it so it ony goes 50...then 100, then 150, then 200, then 250.

The catch...YOU MUST MAKE A FULL SWING. This will make you control your swing speed.