Streaming to Front Row constantly rebuffering

I'm running Front Row on a MacBook and trying to stream video from an iMac.
Both computers are connected with ethernet.
Front Row rebuffers every 10 minutes or so when I try to stream a video with a high bit rate, 4622 kbps for example.
The video is 45 minutes in length and takes only 4 - 5 minutes to copy between the two computers.
Activity Monitor indicates a transfer rate of approximately 10 MB/s when copying the file.
When streaming the file in Front Row, however, Activity Monitor indicates a transfer rate of approximately 500 KB/s. It also takes approximately 1 minute before it starts playing at all.
A video with a bit rate of 4622 kbps should require a transfer rate of 578 KB/s just to keep up.
Why does Front Row utilize so little network bandwidth? Are there any settings I can tweak? I'm frustrated that I need to copy the file over to the MacBook to watch it when Front Row should be more than capable of streaming it over the network.
Thanks,
Matt
P.S. I also tried to stream it directly from iTunes. iTunes doesn't seem to stream at all; it copies the movie over completely before it starts playing it. The network was utilized 10 MB/s for 3 or 4 minutes, the movie started playing and the network went idle.

Confirming the Front Row issue - Activity Monitor reports a maximum of ~530 KB/s when streaming a 4900 kbps movie (wirelessly). The movie takes a while to load, and rebuffers throughout.
Streaming from iTunes didn't work at all.
I also tried streaming the same movie to an AppleTV (wirelessly). Activity Monitor now reported 4+ MB/s, the movie played instantaneously, and it never rebuffered.

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