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Unless someone is simply spamming rightclicks to make a group of units go round in a circle, a high APM usually means the person is doing alot more at one time, such as queuing a new unit as soon as the first is done as compared to perhaps 10 seconds later as one with lower apm might manage. Those with higher APM generally also respond to threats and such quicker, which does make a difference. While it might not win the game, a higher APM usually means a higher chance of winning.
Oobsvr, the only hotkeys are those listed in the bottom right grid when you select a unit, there are no hidden ones, unless you count those not so obvious ones like W to select all warpgates, which while not listed in the grid, is still shown in game.
Unless someone is simply spamming rightclicks to make a group of units go round in a circle, a high APM usually means the person is doing alot more at one time, such as queuing a new unit as soon as the first is done as compared to perhaps 10 seconds later as one with lower apm might manage. Those with higher APM generally also respond to threats and such quicker, which does make a difference. While it might not win the game, a higher APM usually means a higher chance of winning.
Oobsvr, the only hotkeys are those listed in the bottom right grid when you select a unit, there are no hidden ones, unless you count those not so obvious ones like W to select all warpgates, which while not listed in the grid, is still shown in game.