Why do we practice slow to go fast?

Good question.

We all play like we practice. So, if we practice carefully, thoughtfully, and methodically our odds of playing expressively, confidently, at a steady tempo go up significantly. Alas the opposite is true too. 

Let's consider one aspect of this: Slow practice.

1. Starting slowly allows us to consider our motions at the drumkit.
2. Slow allows us to play steadier while learning. Remember playing quickly and stumbling about may make our stumbling get imbedded in our playing. 
3. Speed up bit by bit as your skill with the rudiment, beat, or song increases.
4. To play fast, you will have to practice fast. It is good practice to have your moves together before sprinting through the music. 

David