Again, physics. Surprise. On, my system, most scenes perform better with physics on 3. 80hz is the optimal setting I can achieve at the moment, but would always want to try and keep it at either an even fraction of, or even multiple of 80hz, which is the refresh rate of my Rift S. Previous Rift model was 90hz, you would want 45, 90, 180, 270, 360 on that. When I drop to 60 the physics are alright. 40 looks terrible. 240hz looks amazing but its slow mode. All the other settings besides render scale have almost no impact on my fps. my physics frame time is I think 12 or more ms. Everything else maxed is usually under 4 ms. So everything else is waiting 8 ms for the physics to complete, when if CUDA cores and physX were enabled, physics would likely be the first thing done. CPU resources would be freed up by all the processing on the thousand plus cores of your nvidia GPU. Cores that are just sitting dormant while the rest of your GPU does it's thing. The PHYSICS is everyones number one performance problem, because meshedVR has CHOSEN to ignore it. I will not give someone money who ignores the biggest problem. I'll find someone else to give my money to. Plenty of pieces of software have gone unfinished for the same types of reasons. I'm just making it clear to meshedVR, and anyone else who wants to inform him, what the consequences of his inability to make a simple choice because he has feelings about endorsing one or the other. nvidia works. AMD is broken. Go with nvidia.