Windows Media Center Tv Archive Speed

Is anyone else seeing slow transfer speeds in regards to TV Archive? I'm on a gigabit LAN which basically limits me by my HDD speed (~60MB/sec write). However, when I watch the traffic from Windows Media Center during a TV Archive transfer, it seems to throttle at around 15-20Mbit. I could see the reasoning for this, so you're not saturating your network, but honestly I'd like to see it get done and over with. Instead, an hour show takes an hour to transfer, which causes other I/O on that same disk to be affected for a much longer period of time. I know there are no connectivity issues between the machines, because I can drag/drop the very same recording at ~60MB/sec.

Any thoughts on this? Is there some secret ThrottleArchiveTVUpload registry setting that I could tweak?

Thanks in advance!