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I've used GRUB to dual boot before but I find that in general I always boot into Ubuntu unless I'm going to play a game that's not Linux supported.

Two main questions here

  1. Can I set up the boot loader to always boot Linux unless I "opt-out"? Either by setting a flag on disc when I restart, or having to press an f key at a specific time.

  2. Would I see a noticible difference in gameplay performance if I run windows off of a VM?

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Can I set up the boot loader to always boot Linux unless I "opt-out"? Either by setting a flag on disc when I restart, or having to press an f key at a specific time.

Should be very easy to do by editing /boot/grub.cfg file.

You can read the GRUB tutorial to find out how.

Would I see a noticeable difference in gameplay performance if I run windows off of a VM?

It does affect the gameplay because you are sharing the hardware resources by two operating systems. It is possible to configure your graphics card to work with your VM. Read here.

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You just edit boot/grub/grub.cfg and there is a line named set default="0" set it into 1 if your windows installation is placed second in your boot menu otherwise open and comment other options in grub.cfg and change the default value problem will be solved . If you are playing game using VM it is not capable of processing thats much of graphics as windows ...

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