Check out this site for an GUI for rendering VRscenes

https://vrscenegui.babylondreams.de/index.html#home

The default geo subdiv settings in V-Ray are a bit strange. Perhaps they are good for fine displacement but in general for subdividing they are a bit high. Read on for some suggestions.

OK, so you get funky speckles/noise when rendering without GI but with high samples in V-Ray for Maya? Well, it turns out that if you enable Brute Force GI with Depth and Samples set to 1 (so it won't change the look or rendertime) the noise pretty much disappears!