I’ve been posting some recommendations and settings to get the most of the Index and the G2 on a given system (9700K+2070S) and there are interesting differences regarding performance:
- I can run the G2 with Motion Reprioj. at 90fps/30Hz and stutter free
- I can’t run the Index with Motion Smoothing comfortably
- I can run the G2 without Motion Reproj. at about 35 to 45 fps depending.
- I can run the Index without Motion Smoothing at about 30 to 38fps depending and only if I reduce Terrain LOD from 100% (G2) to 50% (Index).
NB: all 4 with the same base settings for comparison.
At this time, WMR OpenXR is working better than SteamVR OpenXR. However, this might also be due to some “proprietary” or “specific” OpenXR implementation details in the WMR driver which is serving custom needs for FS2020 (both Microsoft apps). It might be nothing but the WMR OpenXR v104 includes specific references (code) internally to “FS2020” (I didn’t check v105).
Otherwise it is just SteamVR lagging behind in terms of OpenXR implementation and they didn’t address performance yet, just conformance (they just officially released their first OXR driver back in July).
[update 07FEB2021]
Since the release of SteamVR 1.16.6 the trend is reversing. I can now push more rendered pixels (render resolution) with Index + SteamVR than with G2 + WMR in general. It is in fact constantly evolving and the next WMR OpenXR preview due anytime soon might again reverse this. Also, this is on my test system and your mileage will vary, but one thing for sure, with SteamVR you get updates more often too.