Hello,
This morning, I was tinkering with the settings in my parallel program to if I can make the my Logos 4 run better when using VM. In Parallel menu, go to -- virutal machine -- configure -- and check mark the "Enable Adaptive Hypervisor" and under Power Consumption, I have "Better performance selected"

The explanation of Enable Adaptive Hypervisor is as follows from Parallel User Guide:
"Using Adaptive Hypervisor
Select the Enable Adaptive Hypervisor option to automatically allocate the host computer CPU resources between the virtual machine and Mac OS X applications depending on what application you are working with at the moment. If your virtual machine window is in focus, the priority of this virtual machine processes will be set higher than the priority of the Mac's processes and as a result more CPU resources will be allocated to the virtual machine, if you switch to the primary OS window - the priority of its working applications will be set higher and the CPU resources will be relocated to Mac OS X."
I am running MacBook Pro 2.53Ghz with 4GB RAM. I noticed a boost in the peformance of Logos using in Parallel.
So far this morning, it has been running very nice.
Blessings,
David