Hi Edelweiss,
I merged your two threads. It helps us if you stay with one thread per game so that we can follow your gameplay. It also avoids pushing another member's active thread off the first page.

You can find all your posts at My Place at the top of the page.
Have you tried turning off any special effects from Options at main menu, to see if that improves performance?
There is a patch available for download
HERE.
Good luck! Let us know if you still have problems.