Originally Posted by
Zombikilla
in a word: yes.
You should pop all your CDs during that 40 seconds (AP / Mana gem / Trinkets /etc.); and due to the increased casting time and stacking of CDs you should have a significantly higher amount of DPS during that phase, more than you are imagining; during this phase you should be able to get out like 35+ Arcane Blasts; and of those many are going to have large damage modifiers / increased Spell power. Haste isn't useless after that; its just less valuable per point compared to Crit and Mastery.