pace, rate - the relative speed of progress or change; "he lived at a fast pace"; "he works at a great rate"; "the pace of events accelerated"

haste, hastiness, hurriedness, hurry, precipitation - overly eager speed (and possible carelessness); "he soon regretted his haste"

acceleration - an increase in speed; "modern science caused an acceleration of cultural change"

deceleration, retardation, slowing - a decrease in speed; "the deceleration of the arms race"

execution speed - (computer science) the speed with which a computational device can execute instructions; measured in MIPS

graduality, gradualness - the quality of being gradual or of coming about by gradual stages