Need to cast a lot of spells

I'd like to cast spells the way a JRPG video game character might while on an XP grind; i.e., quickly and often, without much recovery time. I don't want to re-invent the Magic system. What's an easy way to do this? 100 CPs of Signature Gear: powerstone? 100 points of FP (spellcast only -x%)? Extremely high skill level to lower energy cost? The solution needn't be cheap.

Need to cast a lot of spells