Users who use their virtual machines rarely may encounter slowness and other performance issues after starting a virtual machine if it wasn't used for a long time. Assigning a higher value may cause performance degradation of both Mac and the virtual machine. Note: we strongly advise using the recommended number of CPUs. To check how many CPU units are assigned to VM open configuration window > Hardware > CPU & Memory. For example, if your virtual machine has 4 CPU units assigned, then a total amount of CPU utilization by a VM will be 400%. The maximum utilization of every CPU unit assigned to a virtual machine in Activity Monitor counts as 100%. High CPU usage by virtual machine's operating system. My virtual machine's process (prl_vm_app or Parallels VM) in the Activity Monitor consumes 100% of Mac CPU or above.My computer fans speed up, and the Mac starts to heat up.
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