I upgraded to Parallels 10 to compliment Yosemite and since the upgrade my virtual machine has been running super slow. I can see the screen being layered and built. When I click on my username to login it takes more than 2 minutes to bring up the password field. Once the password is entered I can go make a sandwich and take my time and still come back to see it loading. It is crazy slow. I have uninstalled parallels, repaired Mac HD permissions, reinstalled Parallels and reinstall tools. I have also increased the RAM to the virtual machine to 6GB - which is half of my entire Ram. Mac runs fine everywhere else but the virtual machine is still crazy slow. Any help is appreciated. If I can fix this that is great. Otherwise I need to know how to revert back to the previous Parallels version to get back the functionality.