AMD Phenom II, 945
Nvidia GTS 450
The game runs fine, but interacting with the main menu is very fustratingly laggy, and interacting with the UI in game. It'll hang for a bit when I mouse over, and a second later the click will register.
I've been experiencing this bug for years, but I figured it would eventually get fixed, but it seems like this bug hasn't been. I've seen other people complain about the bug, and solutions get given that don't seem to work. I don't have dual GPUs, I used to have another ATI card plugged in, but now it's just the single Nvidia one.
The game itself runs fine, I can rotate smoothly and everything, but the 2D UI is incredibly laggy, with 1000ms lag or so.