Separate names with a comma.
My external drive was also formatted as ExFAT, reformatted as Mac OS Extended (Journaled) performance was back to normal, as it is an SSD it is...
Looks like I have found the issue I was having. El Capitan must treat USB drives differently to Yosemite. I had rebuilt my Mac and the Win 10 VM...
I have the exact same problem. On Yosemite, Win 10 on parallels 11 ran smoothly. Gaming, Asphalt 8 for example, was smooth but now on El Capitan...