The following parcels in fairly close proximity to one another have prim litter on them, and at least one house:
Boreal 243, 215, 121 (PG) Alphabeta Real Estate
Verbier 27,185,127
Isere 251, 143, 130 PG - Flat Snow Parcel
Isere 217, 53, 120 (PG) - ^Isere - Extra Prims -^
I believe all of these are abandoned parcels, with auto-return turned off.
The extra prims are probably adding lag to this region to some degree, though it's hard to tell how much.
Thanks in advance.