I'm trying to play this user-created map on C3C. Its an XXL map, 360x306, and i'm playing with 11 other civs, the same as I do on a large map. My problem is that once I hit the end turn button for the first time it just sits there loading and loading, then eventually stops responding. This doesnt happen with random maps.

How can I fix this, and whats the problem?

The first turn always takes the longest. What kind of rules did you change? (i.e., did you give the AI more units at the start? Change movement?). Also, what's your computer specs? A slower computer (or one with low memory) will take longer.

"The first turn always takes the longest." "A slower computer (or one with low memory) will take longer."

I realize both of these, but on user-created maps they always take much much longer than just regular random ones. I never have any problem whatsoever with 12-16 civs on a random map, yet it can take a full minute on user-made ones. I didnt change any moves or ai units at the start, but I'll look at what the map-creator set them at.

Any more advice would be helpful.