Speaking as someone who enjoys the opposite, jobs that play as fast as possible....

I'd recommend dragoon since one of the things I disliked most about playing it is how SLOW the job is (especially compared to a job like monk)

Summoner also isn't too bad as far as casters go, and if speed is a concern, it has a bit more mobility than a job like black mage, letting you be a bit more reactive to situations than black mage, which requires you to be more proactive in positioning yourself.

I also agree with the sentiment as far as ranged to go avoid machinist since it requires a lot of button presses, especially during hypercharge phases.