[Zulithe]

Nai, if you are talking about the loading/saving being slow, that is natural. The save files are large and it is a big pain in the ass to wait for it to save :-/

If you mean general performance, try to defragment your hard drive. After that, maybe set the detail level for B&W down to medium (or one stop below what it was before) and set it to a lower resolution, this should help boost the performance until you can figure out why it has dropped so much