Problem Running Windows Games on Parallels

I have installed Parallels connected to a Windows Vista BootCamp partition on a Macbook Intel Core 2 Duo w/4Gb memory installed.

When I tried to test out the Windows response rate in Parallels by running the pre-installed Vista card games, they came up very slowly and the programs were squirrelly and not really operable.

I changed the configuration in BootCamp to maximize the Video Memory at 64Mb, but it did ameliorate the running of the programs. I have not tested a whole lot to see if there are problems with other programs. I did run the Windows Open Office program and it seemed to work fine.

Do I need to change the Video Memory settings in Parallels also? What other settings and things can I possibly change or do to make the all the Windows programs work properly? The installed card games on Vista should not be too video intensive, should they?

 

Parallel does not support directx 9.0c based games. Stick to old 8.1 ones, and some of them will work.