If you are experiencing sped issues you might try to launch the game using a single core. To do so:
Open the Run window by pressing WinKey+R
enter "msconfig" and press OK
on the Boot tab select to "Make all boot settings permanent", go to Advanced options, select Number of processors: 1. Confirm by clicking OK twice.
After reboot the system will use only a single core. Please remember to revert the changes after you stop playing.