Speedup
Part of speech: noun
Definition: An amount or rate of decrease in time taken. The relationship between time taken and number of processors used.
Acceleration
Part of speech: noun
Definition: The act of accelerating, or the state of being accelerated; increase of motion or action; as opposed to retardation or deceleration.The amount by which a speed or velocity increases (and so a scalar quantity or a vector quantity).The change of velocity with respect to time (can include deceleration or changing direction).
Example sentence: In order to seize the opportunity presented by the acceleration of 5G, we plan to invest approximately €100 million in 2018 to meet near-term customer requirements for early 5G trials.