I was looking at my materia, and looking at the spell speed reduction materia. And I was thinking, if I could get +2500, I could reduce the recast (GCD?) to 0!

Then I realized getting +2500 is probably very very hard (if at all possible?).

So my question is, has anyone been able to work out so far what is a reasonable 'upper limit' on spell speed reduction that one could get, and if it is worth it? Is my materia better spent elsewhere?

Thank you.