I have not yet - but I am looking at VRAM and GPU Usage using other tools and I can say for sure it is not anything to do with lack of available VRAM on my card.
What I see is just a significant but constant performance drop. Drops to low 20’s to low 30’s FPS, but it is still ‘consistent’ if you know what I mean, not lurching. A steady but bad frame rate.
I flew in NY just now and it was mainly smooth as butter, but then arrive over Central Park and it goes again. So it could be the trees?
Had to turn resolution and stuff down to keep it sort of OK but even then it spikes to 100%. It can run 100% and still be 36fps locked smooth (that is my target for 72Hz VR) but sometimes it is like it just suddenly snaps, so it is very weird.