We've uninstalled the SEP client from the server (SEPM is still installed) and the problem remains. So now I have these results:
SEP Client on testing PC - bandwidth cut by 33-50%
SEPM on testing PC - bandwidth cut by 33-50%
No SEP components on testing PC - bandwidth speed as expected
I don't see Teefer2 listed in the network components anymore - could it still be there and causing problems?