Timewarp/ reproject for VR scene inspection

There are a lot of performance concerns with launching large/non-optimized scenes in Eevee VR, but the biggest concern/easiest solution would be fixing the lack of timewarp. If the render engine cannot complete the next refresh in time, it should fall back to a reprojection of the previous refresh displaced/rotated with the latest head orientation data, not simply redraw the frame. Simple redrawing causes AWFUL jittering on unoptimized scenes and makes VR scene inspection unusable :(

This is a relatively simple piece of technology that comes as standard in most VR engines, and it would enormously extend the number of scenes which can be feasibly viewed in VR. I assume it's already in the pipe but I'm here putting in my vote to give it higher priority!