My workstation has VMWare Server, and I'm running a few VMs for mocked production environments.

I'd like to artificially slow them down, which should make finding poorly-performing code easier. While only having 4GB of RAM on my Win7 box, juggling VMWare + VS2010 does a good enough job so far of slowing things down :|, is there anything else I can do specifically to reduce the performance to maybe the equivalent of a dual 900MHz CPU and 128kbit ISDN line?