So I am running Gangland on Windows 8. No matter what previous edition of windows i run it in it still lags. This is really bad lag too. The mouse is fine it's just everything else lags. Any ideas on a fix?

Had the same issue, restart of the PC cleared it up.

Run it as the first thing when your PC boots. Also, play with the video modes on the setup. Some levels would crash and stutter with one and be fine with the other.