I am running host OS Sierra 10.12.3 and I have 3 Virtual Machines open at the same time also running Mac OS Sierra 10.12.3
Sometimes the VMs run very smooth and everything is fine. But too often they run extremely slow and it takes forever just to do something simple like click on a link or open a new tab in my web browser.
I run them off an external HD and I can hear the external HD spinning and working very hard when these slowdowns occur. Does this slowdown have to do with the external HD I am using? Is there anything I can do to speed things up? Thanks for any support.