Optimization Settings
In the Optimization pane, you can limit the virtual machine resource usage.
To open these settings, choose Actions > Configure > Options , then click Optimization .
         
        
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             Option  | 
           
             Description  | 
          
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             Resource usage  | 
           
             If your Mac lacks resources for running two or more virtual machines at a time, you can limit the virtual machine resource usage for the virtual machine doing more important work to have more resources. Drag the slider between Low , Medium , and No limi t points. If you change this setting and then don't like how Windows is performing, then try a different setting.  |