Speed and Efficiency in APM
A player's APM value is determined by the number of actions performed in a given minute. Some actions, such as repeated selection, are easier to carry out than others, and players may repeatedly perform (or "spam") these actions and are consequently redundant in terms of their usefulness. Although, "spamming" may be used as a way to warm up and maintain speed for later phases of the game, or it may be used simply to increase a player's recorded APM in order to improve the perception of their gameplay skills. Because of this, more sophisticated measures of APM may attempt to filter out redundant actions by means such as ignoring re-selection of a group of units which was already selected and ignoring the very beginning of the game (when the typical relative lack of action facilitates spamming), in order to only measure a player's "efficient/effective" APM value. However, there is currently no standardization of what constitutes an "effective action" and APM is therefore typically recorded without any filtering.
Read more about this topic: Actions Per Minute
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