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Are you talking about speeding up movement and melee units reaching their destination faster? If so, I have to disagree, because when attacking a Castle, you don't really spread out, and secondly, the enemy might have an Earth Expert with a slowing effect.
2 Geksorin
Calculations show that, without considering morale/luck drops, 200 upgraded archers will still deal more damage than 60 monks (assuming both are shooting).
The Air Elemental is definitely good, especially considering its damage and price!
Goblins are very good when there are a couple of recruitment buildings near a Titan Castle:))) You take them, upgrade them, and off they go!
I already wrote about goblins, saying that they are effective in the first 3 weeks, which is what you meant. The key to success is simple: you upgrade them and run around for 3 weeks, gathering resources for Titans, and then, as they say, you're in control!:D
I think Air Elementals are the most effective ranged units overall.
Speed 9, 25 health, plus decent attack, defense + damage, it's just "Awesome"... but Conflux is a completely different story.