Copy from my post on fb:
"hi, i've proved different combinations to get the way to understand the variables of vr performance. mostly used fpsvr to check cpu and gpu frametime and the most perfirmance killer was the shadows. even in only flat, cpu goes down (with everything in low to minimize gpu usage). cpu graphic turn to red with >30 and fps drop to 27. gpu varies with other settings, but cpu show low usage but too slow. it does no change if mhz is 3600 or 4200. so, with shadows off, everything goes like charm, with both fpsvr graphics in yellow/green. is there any way to reduce shadows draw distamce to test?
specs: ryzen 3600, 16gb 3200, gtx 1070, rift s"