Quote Originally Posted by ViviAnimus View Post
https://www.youtube.com/watch?v=tEPJ3rNBkUA

At 2.05 minutes you see an example of this. Every though I had 700MP left, so pay no mind to that. As you can see, what is being done at 1300 MP is Fire I is casted and BEFORE you are going to regen your mana with Blizzard III, you preemtively press the Fire III button in case a proc pops.
Another example at 3.35
Wow, you see/get the proc's pretty much instantly after the cast O.o

Mine take a lot longer to show up.