I'll chip in on this one (something I rarely manage on the golf course!)

I've recently discovered my natural tempo after having some coaching and really improving my swing. It's difficult to categorise but I guess you would say it's fairly relaxed. I can speed it up to really go after a shot but I do have to make a strong conscious effort to keep my body and legs in sync with my arms. If I don't then I hit a bad shot. Conversely, I find it almost impossible to slow it down and attempt to caress a shot. When I'm not striking the ball well my first thought is to concentrate on my swing tempo and almost always it works. I think Mizunoman has the same experience.

I've read quite a lot about tempo recently and almost everyone seems to agree that every shot should be played with the same natural tempo (driving, pitching, putting) with control of power and distance achieved by varying the length of the backswing.
I'll go with Graham on this one, don't fight your natural tempo, fast or slow, as it's not a battle you can win.