I'm getting this issue as well. On Linux (wine), I'm able to run BL ~300 fps, on a GTX 750. In my VM with a 1070, I barely get 60 fps. I've allocated 6 cores to it, 8gb of ram, enabled all of the hyperv extensions, etc, etc, to increase performance, removed Xbox Game DVR, messed with NVIDIA Control Panel settings for 3D apps, and the like, but it's still horrible.
Ugh.