I have an aging late 2012 iMac and had very poor performance with my win 10 VM mostly because of 100% disk usage. It was almost unusable. Disk utility/First Aid said my HDD was ok, but another utility said it was failing which after 6 years I was not surprised I replaced the HDD with an SDD and it made a huge difference both with my Win 10 VM and iMac in general.
