Quote Originally Posted by Ghishlain View Post
While Haste does serve a similar function to Skill and Spell Speed, they are indeed different parts of math being calculated. DoT potency is based off a function of Skill / Spell speed. Notice that when you use a Haste buff, neither of these stats actually increase, and thus the actual potency of DoTs won't increase either.
Hmm I'll have to take a look at my stat sheet with an Arrow buff when I get home. Never bothered to check.