Render less on Oculus HMDs using stencil meshes to reduce frametime, for some reason they've never been exposed via OpenVR so hard code ones dumped with libovr.
* Rift CV1 renders 14.07% less area
* Rift S renders 11.26% less area
* Quest renders 5.69% less area
* Quest 2 renders 9.13% less area