How fast should you perform a lift or exercise?
The answer to that question really depends on several things such as your goals (e.g. what you are trying to accomplish with the lift), your experience level, your physiology, how much weight you are lifting, and whether or not you are doing Tracy Anderson workouts. In the case of the latter you should plan to flail around with 2lb dumbbells for your whole workout. P.S. Don’t do that.
Like everything else in life, there is a time to move fast an other times when you should move slower. Let me explain how to incorporate this into training.