Nanite in VR? 5.1? 5.2?

Unreal 5.5 Quest 3 attempting a Nanite landscape with displacement. Works “ok” at High or Medium linked via a usb cable. However there’s REALLY bad tearing in the lower area inside the Q3 and the framerate is barely useable for previewing. I don’t see this tearing on the desktop preview video. I’d really like this to be doable when the RTX 5090 is released.