What actions in Lightroom slow down? Does this happen for all photos, or just some?
Do you do a lot of brushing or a lot of spot correction?
for all, scrolling up/down in Library view is getting slower (no significant network traffic though) also swithcing to development or other modules, menu open etc. until it stalls completely.
I currently have just 2k photos in the catalogue most of which are unprocesed..
Have you tried running LR outside of the virtual box? Or is that not possible?
Because you are the only person reporting this, and you are also the only person I have seen here running Win7 / Lightroom in a virtual box.
So, that's the primary suspect in my mind.
I also assume, that is somewhat related to Virtual Box. I'm running linux only on my PC and therefore I don't have windows running on a native machine(to run both and share data on the fly) Since I never experiences such an issue with programs on VM I wonder what LR does differently?