Even at mid-game with hundreds of machines, trains, 40 coal power generators and miles and miles of conveyors belts, it can get 30 FPS on maximum settings with a very old GTX 580, 50~80FPS with minimal settings. You can try to mess around with the console to turn off the fog and fine-tune settings (including an in-game FPS counter).
But dude, sincerely, your post sounds like an unnecessary rant