I think you guys are talking about the new culling introduced in SU5. It means when you turn your head, the sim loads some new objects and they appear from nowhere (mostly noticeable on distant trees and buildings, but some close by as well), or otherwise they increase in LOD from low quality models to higher quality models (this can be at all ranges, and is most apparent on trees). This didn’t happen before SU5.
I find this really breaks the immersion in VR, if this is what you are referring to then please vote and contribute on the below bug thread as the developers look at that and we need more VR voices. Thank you!