The frame rate is fine in person, with these avatars. I think the delay/low FPS was on the 2d capture side. But sheesh, that should have been worked out.
Same experience with the Quests about 2D capture.
If you allow video capture to kick in, rendering resolution is lowered, the devices struggle to maintain proper frame rate, Asynchronous reprojection kicks into high-gear.
It's really a hardware limitation of those mobile SOCs, but pretty embarrassing none-the less.