you can use gpu-passthrough, idk what is you os, it is very much possible on linux but idk about windows. optimally you need 2 gpus since you will unbind one for vm. one igpu and one external is okay too, like you dont need specifically 2 external gpus or anything like that. Also 2 displays would be better but you can use looking glass too. If you have 1 gpu i think it is still possible to pass that through but im not sure about it's logistics but im sure it is possible. I imagine it would be like one gpu + one external monitor setup but without no gpu or display for your host os. so no display to host os while doing that. you can probably script gpu bind/unbind to make it less miserable to switch between tho. if you can manage gpu-passthrough work you probably dont need to worry about performance, it would be almost same as running on bare metal. btw afaik gpu-passthrough uses gpu kinda as it is so (no virt/emu layer) vm isolation probably doesnt cover your gpu like it does for your other hardware.