This update is available on the beta branch for QuiVr. It can be accessed by going to your steam library, right clicking QuiVr, and selecting Properties -> Betas -> and selecting the 'beta -' branch. You can revert this by going to the same place and selecting 'NONE - Opt out of all beta programs'.
Performance Setting - View Distance
This patch introduces a new "Video Setting" slider, View Distance. This will allow you to pull in the view distance, sacrificing draw distance for performance. The setting introduces a gray fog gradient to smoothly transition into the distance, allowing objects farther back to be ignored by the rendering loop.
Please let me know if this helps performance for those who suffer frame drops at higher difficulties!