VMWare, if not properly managed, will eat all CPU resources you have and choke any GPU clients you have operating. This will result in drastically lowered PPD. I suggest a handy program called Prifinity (PriFinitty 2 by Ed Wilk). If in Vista / Win7, set it up to run as administrator. This program allows you to set the GPU clients to higher priority then the VMWare consoles, and it allows you to save that setting. Then, with 'boot with windows' its able to start and apply all preferences on startup which was very handy for me. Lastly, if you need to change affinities and lock certain processes to certain cores, this program can handle upwards of 8 cores and their respective affinities. You shouldn't need to lock core affinities with VMWare and the GPU consoles though, I found it hurt my PPD.
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