Dmitry, For what it's worth, I have been using external drives (USB2, USB3, FW800 & TB1 & TB2) for YEARS with my many test VMs, through many versions of Parallels and MacOS, and using both Windows 7 and Windows 10. Never had a SINGLE issue as a result. Until the latest build of Parallels. So, it certainly feels as if this advice is just more delay and obfuscation and general failure. Oh, and I have the same issues with my production VM that IS on the system drive, which is an SSD. So yeah, drive performance isn't the issue. As for reducing the CPU count, what exactly did we pay for with the Pro version then, if it's so gimped it won't work unless we use it like the cheaper non pro version? I know, the best performing, most stable, most value adding Parallels is the one that isn't running, because I'm using VMWare now. Sorry to be so snarky, but jack shit for a meaningful response over multiple MONTHS is a little hard to swallow, for a "premium", "professional" product. And yes, I still want my money back. Parallels Pro is a ripoff.