Throughput

In human-computer interaction, throughput is a combined speed-accuracy metric derived from Fitts's law that measures the efficiency of aimed pointing movements, expressed in bits per second (bps). It is calculated by dividing the index of difficulty (a function of target distance and size) by the movement time. Throughput is the standard metric used to evaluate and compare pointing devices, interaction techniques, and input methods, including assistive technologies. Typical mouse throughput for non-disabled users is 3.7-4.9 bps, while people with motor impairments generally achieve lower values.