Rebel Century 4.0.

So i managed to install on a Core 2 Duo T5800 2.0 GHz machine with Windows Vista and via VMWare the old Windows ME, and then i installed the old Rebel Century 4.0 successfully.
But there is a problem. The response is super slow and the menus and all that are opening with turtle speed. Apart from that, everything is fine but that is a big problem.
I applied the Pentium IV patch just in case, but nothing changed. Rebel Century runs fine(i run it with the -V parameter) but the menus and all the mouse-piece moves etc are very slow.
I guess it is because of the unknown for Rebel, CPU.
I don't have much hope, but can anyone recommend anything to fix this problem?
