Wrong forum and no, not really. The game engine is fully 3D; you could give all terrain no height information or make it all look like grassland but that won't affect anything. The few dozen extra polygons for 3D terrain aren't what's slowing your computer down.
It's faster in 3D because your computer's graphics card can do a lot of the math for the computer. With a 2D game, you have to do nearly as much math but the graphics card can't do any of it, which forces your CPU and main RAM to handle all of it.
For most general gamers, 3D is faster. For most CIV fans, considering the insanely ghetto videocards that some of them seem to show up with, this may not hold true.
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