Sorry fellas, I was at the Open, back to NY for one day of work and then off to Mobile for meetings. Got to play Robert Trent Jones Magnolia course down there - what a track. Has anyone played all the Trails in Alabama? I gotta get down there and play them all before I get too old.
Anyway, back to swing tempo. A quick tempo by itself is not a terrible thing. Look at Olazabal or Nick Price's swing, they have incredibly quick tempos. There are 2 keys to tempp: 1) stay in balance 2) keep it constant.
1) The biggest problem players have with quick tempos is that they throw themselves off balance when they take the club away too quickly. When you are off balance, your transition to the down swing is screwed up. The result is that there is little opportunity for the club head to accelerate, and thus, there is a lack of power. One must be able to have the club change directions at the top of the swing in such a way as to allow the entire downswing to be a time for the club to accelerate towards the golf ball. Power is generated by doing this.
2) Everybody has a different tempo. Like I said, Price is a million times quicker than Els. The key is to have a consistant tempo. Underpressure, any club, any distance, constant swing tempo. If you muscle up or ease down, many times you hit a poor shot.
That is why I suggested singing a tune in your head or saying your name in a rythmic fashion. The key is to have your tempo back be the same as your tempo through -- regardless of how quick or slow that is.
The broom drill recommended by Skinar is a great drill. It mimics one of the most-used training devices on tour - the plastic fan that most players use in their hotel rooms. I would strongly suggest not lining up balls one after another. Several reasons, you will never hit 7 balls in a row in a round; you aren't practicing good technique, you'll rush through them; and you won't know what you're doing wrong.
In fact, this is another good tip. Next time you go the range, put your bucket of ball either compltely behind you or 4 feet back from the tee. Force yourself to slow down in between practice balls. Don't rapid fire through your bucket - you won't learn half of what you learn when going slowly.