in this Steinberg thread I explained an issue in combination with VePro.
I have a buch of tracks organized in different root-folders (Woodwinds, Brass, Strings)
When I copy the pure tracks (2) , it's fine. As soon as I mark the root-folders (1) and copy, I get a massive lag. (10-20 Sec.)
Cubase hangs during this workflow. After a while I can paste the data.
It happens with VePro tracks.