Low frame rate even with high bit rate

I am using a Logitech QuickCam Pro for Notebooks (the model that supports UVC per Logitech's website) with a new Mac Pro and iChat. Whether I do a video iChat over the internet or one within my internal network, the fps per the connection doctor of my camera is about 6 fps, even if the bit rate is over 2000 (which is what is was when I did the internal network chat). I can't find any setting where I can increase the fps rate, I can only increase the bit rate in the camera preferences in iChat.
The camera is capable of up to 30 fps and when I do a video recording with it in QuickTime Pro and play it back, QuickTime Pro shows the frame rate as 30. So the camera is connected properly and is working properly. Any ideas on how to get the fps up to 15 in iChat (which seems to be the maximum, per the MacBook Pro I used for my internet network test above)? Thank you.

Thanks for the reply, Tony. Changing the bit rate limit to 500 did not cause the frame rate to change. On my test with my internal network if I had the limit set to none then bit rate was over 2000 but frame rate was only 5-6. When I limited the bit rate to 500 it dropped while the frame rate remained unchanged a 5-6 fps.
When I was doing an internet chat I also changed the bit rate limit to be none, 500, or 1Mbps to see what would happen and the connection doctor showed my frame rate staying at 5-6 and my bit rate staying below 100 (so changing the maximum bit rate setting made no difference). Meanwhile, the person I was chatting with had a frame rate of 15 and a bit rate of about 250.
I'm on a cable modem just like the person I was doing the internet chat with, so I guess the problem is something to do with iChat and my Logitech web cam, not my internet connection.

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