With a second GPU you can get near bare metal performance by using PCI passthrough [1] on UEFI systems. The VM gets exclusive ownership of one adapter essentially. I am currently running Arch for a host, Photoshop via Wine and in Win VM. In the VM it runs far better, just like a native Windows dual boot. I use various Windows and Mac VMs and I routinely game on one monitor while my spouse plays games on the other, runs great. We've joked that Windows 10 runs better in Linux and is easier to manage.

[1] https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVM...

edit: Less overhead required for quick usage but no super cow powers, thats why I bother loading via Wine also sometimes. I know someone was wondering...

Also, my Wacom works flawlessly across all OS and seamlessly transitions in a QT5 virtmanager session from Plasma to Windows. ymmv, consult docs for configuration options. I've seen people saying you cant do this, bs.

This sounds very attractive. Do you have to have a specific gpu chipset for OS X if you do the pci pass through? Would you consider listing your hardware?

Specs and more, but with added storage, cooling, power, and a second gpu now:

http://hwbot.org/submission/2365111_guiltypixel_cpu_frequenc...

Thank you. The specs list shows one GeForce gtx 660 ti. Do you have two of these?

One 660 and one 260 :)