Jeet Kune Do: Speed

Perceptual speed: Quickness of the eyes to see opening.

Mental speed: Quickness of the mind to select the right move to make.

Performance speed: Quickness of movement in carrying the chosen move into effect.

Initiation speed: Starting from the right posture and with the correct mental attitude. 

Alteration speed: The ability to change direction midstream.  Involves control of balance.