If it's not there you can create it but be careful you don't name it. Open My Documents\My Games\Fallout 4VR and look for a file called Fallout4Custom.ini. You can alleviate a lot of the stuttering, poor framerates and reprojection with a few edits to the games. When you add the extra horsepower you need to render it all in VR, it's a complete mess in places with a lot of rubble and clutter, so half the game seems horrible to play. The developers did a decent job pre-combining much of the scenery from thousands if tiny objects into a smaller number of larger objects in a lot of places, but when you are in certain areas of the map it's just not enough. Fallout 4's engine depends on brute strength from your graphics card a little too much.