In Civilization 4, how do I get things to build faster?

Jaaazz man.

New member
Like in the beginning after you build your first city, sometimes when I make a warrior it takes 15 turns, sometimes 30. What causes this and how do I make it happen all the time?

p.s. If it matters, sometimes I play on epic speed, sometimes on marathon. But I haven't kept track it it affects anything or not.
 
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