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"

fleetness - rapidity of movement; "fleetness of foot"

immediateness, instancy, instantaneousness, immediacy - the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication"

expeditiousness, despatch, dispatch, expedition - the property of being prompt and efficient; "it was done with dispatch"

promptitude, promptness - the characteristic of doing things without delay