Magician %/s (KMS FLY 2 & GMS Dawnveil)

Query: How did you determine the Weapon Speed? I thought magic attacks had a whole different set of speeds, which is why a weapon booster skill would be useless on them? Is it just the weapon speed of the weapon you're using -4?

For example, a Staff that has a Slow (8) speed, the actual spell/magic speed would be (4)?

Every Magician except Battle Mages use a base speed of 6. Magic Booster is -2. Speed Infusion stacks on top of this up to -2, to reach Fastest (2). Battle Mages use the weapon speed of their staff.