To paint the picture; i'm currently running Parallels 11 for Mac Pro, with Windows 10 being installed on bootcamp. My Mac is the 2015 iMac, 16gb RAM, 1TB HDD and retina 4k display, newly installed and arrived on my doorstep. I have assigned 500gb HDD to the Windows partition and 8gb RAM. When I run my windows machine using parallels desktop, I have constant, 100% disk usage that doesn't go down, without running any programs, it takes almost 10 minutes to start and just acts totally sluggish, running Visual Studio 2015 community (the only running application) is painful and unusable. I tried to turn off Windows Defender, but this makes no difference, and also the opacity and transition effects in Windows 10. Any ideas on what to do next?