Video Slows Down Dramatically At Start of Video Chat Session

When starting a video chat with mate, my video starts fine and then quickly slows down to virtually nothing. Video of me is good in preview but when I start a video chat with mate, it all goes down hill. Connection Doctor tells me my framerate is 1 fps. Why does video speed deteriorate so quickly after video chat is started? Any advice would be most helpful here. Apple Tech Support says its likely to be a software issue. I though upgrade to 10.4.5 would help: it didn't. Anyone out there experiencing the same thing??
i-Mac G5 Mac OS X (10.4.5)

Hi ogorki,
Welcome to the Apple Discussion Pages.
See this FAQ for more on what Defcom says
http://discussions.apple.com/thread.jspa?threadID=278760&tstart=0
Most likely cause is Updating from Panther rather than a fresh install.
One other thing not in the FAQ.
Open Activity Monitir from Applications/Utilities.
Make sure All Processes is slected in the top drop down.
Check to se if a Print Manager is listed as running even when you are not printing.
If it is highlight it by clicking on it once.
Use the Big red stop button top left and Force Quit.
2:16 PM Sunday; February 19, 2006
iChat Resouce Web pages

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Video Slows Down Dramatically At Start of Video Chat Session

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