QUOTE(Nano_ @ Jan 4 2006, 10:25 PM)
x4 Speed actually speed's up a unit's movement and attack, while x2 Speed only speeds up the unit animation, )Ex. Moving up and down, Turret spining, Attacking), But in reality, deals the same effects as regular speed.
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There's a map Tarpit D 2 (2x speed) where archons actually deal damage twice as fast , not just the unit animation (I'm 100% sure of this).