Imp. Fireball and Imp. Frostbolt damage coefficient changes

[TheDragoon]

So by your own math, it's a 4% decrease to total damage done. You know who hates it when their talents do that to them? Everybody.

For that set of circumstances. But note where he says that other sources of mana regeneration would likely completely remove the difference, leaving the talent with its full DPS increase via casting speed change.