a fix and a change has been made to the AR.
instead of 50/100/150/200% boost to attack speed, it now does 60/50/40/30% boost.
the upgrade info says +10% to attack speed but it really decreases it. the damage increases of 120/150/180/200% means the dps does increase with each level despite the decreasing boost to attack speed, but i think this is probably another bug. attack speed boost should keep increasing with each upgrade, and if they need to prevent it from being too powerful, they can decrease some of the damage boosts and attack speed boosts. but they must keep increasing. i.e. 20/30/40/50% attack speed increase at 120/130/140/150% dmg increase