OpenXR Toolkit (upscaling, world scale, hand tracking...) - Release thread

[mbucchia]

Heads up on this OpenXR Toolkit issue detailed here:

RTX 4090 performance with VR (Ryzen 5900X / Reverb G2)

They are originally meant to be the same but I discovered later there is a difference. OpenXR Toolkit measures app CPU from the start of a frame to the end of the frame. This means it includes only from the moment app says “I’m starting to render now”. WMR overlay measures app CPU right after frame wait has completed and until the end of a frame. The semantic here is “runtime says you can start rendering now”. A disciplined app should begin rendering ASAP after frame wait (since rendering is…

Short version: the OpenXR Toolkit app CPU overlay does not mean what you think it means. It is analogous to the RdrThread from MSFS’s own overlay, which corresponds only to the CPU overhead needed for rendering only. It does not include app CPU overhead from the rest of the game. There seems to be a huge difference for some of you between the app CPU value and the full app frame times reported by other tools (eg: MSFS overlay, WMR overlay).