use Robocopy instead of xcopy.
There is even a gui for it
http://technet.microsoft.com/en-us/m.../cc160891.aspx
I use it for a couple of different transfers and it works quite well.
Xcopy is good, but getting outdated since it was replaced by robocopy. I am not familiar with the indepht programming but I would guess xcopy as a base of copy has not progressed on the optimization for faster network. Explorer on the other hand has.