Has anyone done theorycrafting on stat weights yet?

[Dervy]

Yes, a lot of people have. Here's something on Spell/Skill Speed. This was based off P3 mechanics, but it still looks accurate:

https://docs.google.com/spreadsheet/...GRlVESlE#gid=0

Also valk.dancing-mad.com

[Applejack]

So you need about 860 (.5 sec reduction) spell speed before you can really see a difference.

I would assume that this acts like haste-rating in World of Warcraft as a very important if not most important stat for casters. I don't see anything about determination on the doc so that's probably still being tested. I wish I knew how determination works so that i could determine what materia to focus on for min/max stats.