What makes a blade fast?

I am curious what aspects of a blade make it fast.

If I had to guess I would think the ply, materials, stiffness, and size of the face had much to do with it.

Also, in what ways does the total weight of rubber and blade affect racket performance?

Hi,

I am not sure here but I would say the type of wood is a big factor as well as the number of plies.  Softer woods would be slower and hard woods would be faster.  I am not sure about the size f the face though.  Interested to hear peoples thoughts.

The weight is a preference.  I like lighter blades because I feel I can be more creative with it and change direction more easily.  Others like the heavier bats though because they feel like once they get it moving it will be able to generate more power.