Thanks you Vodrin for the very comprehensive answer

I actually have a question in this regard... Alacrity seems like a very useless skill to me.. Im thinking that reduced casting times of course makes you capable to deal damage quicker, but wont this just lead to an increase in heat, and eventually you will deal roughly the same damage? Or have i misunderstood something? I.E. The time it takes you to cast something, is also the time you wont be creating heat.