the only time it matters is when you are killing a boss, so you will always have time warp. That means 15% haste is cap since less than 1 second ABs are haste capped. Mastery is the best stat after that. BTW most bosses last around 20-30 seconds, with the higher health pool bosses taking almost 40, which is perfect for time warp.
edit: and the fastest kill I have for a heroic boss is Corborus, with an amazing 10 second kill =D
Connect With Us