Originally Posted by Alvira
If the goal of every aspiring arcane mage is to reach 100% AB spam in a raid fight.
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No, the goal is to maximise damage, just like any other dps caster class. If that means popping your Hero+IV+Skull with Frostbolt instead of AB, then so be it.
The best advice about haste is to work it out for yourself, depending on your gear and the fight you are doing. Instead you seem to want to come up with some generalised theory based on assumptions which don't stand up to deeper scrutiny. You can't say "haste is bad if X" because X is actually a combination of 50 other variables. For instance you said, "if you add enough haste, then you won't be regenning mana even during your AB rotations because you cast them so fast they use up more mana than you regen" - show me the gear where this is true. Even with full Sunwell gear, over 400 haste I'm seeing the opportunity to cast 2900-3000dps frostbolts
which still return 64-75 mp5.

Part 2G: Haste Rating. How important is haste to Arcane?
Haste rating in gear, another big topic in itself. Since patch 2.4 the minimum GCD has been lowered to 1 second, so while in previous patches arcane mages avoided haste entirely, it is now at least useful for us, whether for AB spam or cycles. However, arcane mages are still wary about adding a lot of haste to their gear since it may throw us below the GCD when we activate IV, drums, skull or are under the effect of heroism/bloodlust.
Balanced against this, based on the theorycraft, high haste rating can still be useful. There is no general advice to give here, except to say that you should try to model your situation as well as you can. Use Rawr or prefered modelling tool. If your guild is working on Supremus you will likely different results than if you are working on Brutallus. Make sure you account for this and be prepared to use a different casting plan and different gear on different bosses, depending on available mana throughput. As soon as your hasted AB spam goes under 1 second, be prepared to think outside of the box, e.g. casting only frostbolts for the duration of a heroism may end up being better overall damage on a fight, however counterintuitive it may seem at first.
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