I have three items that increase my attack speed. One is a one handed weapon. The tooltip reads Increases Attack Speed by 7%. The weapons attack speed is in fact 7% faster than a normal weapon of it's type. But when I dual wield, by other weapon doesn't benefit from it.
I also have an Amulet that reads Attack Speed Increased by 10%. When I equip this Amulet, the attack speed of both of my weapons increases by 10%.
Where things really get strange however, is with my gloves. Those read Increases Attack Speed by 15%. Awesome! Except, when I equip them, my attack speed doesn't increase at all.
What's the deal with Attack Speed affixes? Why do they seem to only work sometimes, and even then, not always for both weapons?