the metric came originally from a program called BWChart (http://bwchart.teamliquid.net/ http://bwchart.teamliquid.net/), and calculated APM based on all keystr

the metric came originally from a program called BWChart (http://bwchart.teamliquid.net/ http://bwchart.teamliquid.net/), and calculated APM based on all keystrokes and mouse clicks. So for the first 30 seconds of a game, it's trivial for anyone to have an APM of above 300. The pros, though, are able to maintain an insane 300+ APM over long games while maintaining meticulous control over their units.