[Cyanide]

Originally Posted by aLtMrFool

When dual wielding, you're automatically given +15% IAS, however, you do not attack with main hand weapon exclusively / both weapons at the same time, you attack with main hand then off-hand alternating between them and thus if your weapon DPS differs by a huge margin, you may be better off with a shield despite the marginal increase in IAS.

Which is why when you dual-wield, you should have as little difference between the 2 weapons' DPS. I read somewhere that it should be +-15% difference tops.