Time Mage (Support Magic DPS class) with able to Slow Time, Haste+

[Gilraen]

Barring that Astrologian already has Gravity (and the dumbest pun in learning it) this would require Square to allow us to have some of the other spells you've mentioned. Slow only ever seems to be as a side effect and doesn't affect attack speed, only movement speed. Haste and a proper Slow seems strictly the purview of monsters and NPCs, like the Company chocobo. Meteor... is a mage limit break. The level 2 one I believe.

[Darkstride]

Barring that Astrologian already has Gravity (and the dumbest pun in learning it) this would require Square to allow us to have some of the other spells you've mentioned. Slow only ever seems to be as a side effect and doesn't affect attack speed, only movement speed. Haste and a proper Slow seems strictly the purview of monsters and NPCs, like the Company chocobo. Meteor... is a mage limit break. The level 2 one I believe.

Slow most certainly does lower attack speed as it affects your recast. Heavy is what affects movement speed.

The devs have stated before that they do not want a Haste spell. I don't think they want one job having an ability that everyone would deem necessary all of the time. They like things to be more "balanced".

I think Astrologian already fits the Time Mage/Support role as much as we need it to. Time Mage would simply exist for nostalgia rather than being unique and useful.