First, I LOVE this mod! It not only increases the amount of stuff to build, which is my primary joy in Civ games, but the pacing is GREAT! Spending an hour or more in a certain era while being able to produce units and buildings in a reasonable time is fantastic!
So far, my only issue, which has been pointed out further up the thread, is an EXTREME slow-down around turn 300. It gets so bad that any action which seems to "delete" a unit can take 20-30 seconds. Upgrading, using a builder or GP's last action, killing a unit, etc...
Also, the slow-down happens during the AI turns and I think it may be related to the effects above. Plus, when my turn starts again, my character's portrait will be active but I won't actually be able to begin my turn for another 30 seconds to 2 minutes.
Otherwise, Horem, EXCELLENT job! I was waiting for something like this to drop and you and yours did so before Fraxis even released the mod tools! Kudos!
If you need anything from me to try and track down the performance issue, just let me know!