Goldchocobo: hm, here is an idea... How much RAM and what kind of graphic card do you have? I get unbearable chop on my laptop, and that's mainly due to the lack of memory, I think.
2gb ddr 2 800 mhz, core 2 duo, 8800gt.
I managed to get it working but tuning down the settings to 1680-1050, no v sync, 2x AA, 4x antistropic, fast ambient and fast interaction shader.
That's a massive downgrade from my previous settings. The map still has massive fps issuse, and crashes every 10 minute or so (also breaking my savegame files).
I don't want to be mean... this map is simply gorgeous, but I'm positive the visportals are to blame. I took a quick look at it and it desperate needs help. I've had identical problems with my city. I eventually found clever tricks to split everything up, and cut off area's which 2x'd my fps and eliminated crashing. You could easily
double your FPS on this map, and eliminate the possibilities of crashing with a day of work.
But oh man the map looks beautiful.
Any chance for a 1.1 return to the city?
edit: I don't mean to be discouraging, this map has a lot of expertise in it and it really shows, but it's all the more reason to re-visportal area's of the map.