In StarCraft, my favorite RTS, there's a common term known as APM. APM stands for actions per minute, which refers to how many commands a player is able to enter per minute. If you have fast fingers and you're incredibly skilled, your APM can soar into the hundreds with your flurry of multiple commands per second. If you're an average player, you will probably stay under 100 APM for the majority of each game. APM isn't a direct indicator of player skill but rather a measurement to describe the way the player is interacting with the game via a keyboard and mouse.
The tempo of our rogue rotations is a topic that I love exploring. Subtlety feels fast to players, while assassination rogues often complain that their rotation is slow. By applying the concept APM and a few other input metrics, we can try to quantify exactly what makes a rotation seem fast or slow. Rogue rotations are constantly evolving between expansions and even as we acquire gear, and math can help us examine the net effect of these changes.