from here https://devtalk.nvidia.com/default/topic/987899/vr-funhouse-modding/is-quot-full-vrworks-graphics-ue4-14-quot-on-the-road-map-/post/5085415/#5085415
One guy saw a 38% increase with multi-rez
https://www.reddit.com/r/Vive/comments/63iwh3/nvidia_vrworks_415_branch_for_unreal_engine_4/dfuj2r3/
and another said try not to merge more than the VRWorks Branch unless you feel like fixing some bugs
Here is a bunch of info on lens matched shading (part 1-3) https://developer.nvidia.com/lens-matched-shading-and-unreal-engine-4-integration-part-1