IChat audio fine, video slow and sync drifts

Hello all,
I upgraded to OS 10.5.2 last week on my iMac G5 2.1 GHz PPC G5 with 2.5 GB of RAM. I can text message all I want, but my one to one video conferencing does not work properly.
Audio is fine and works in real time. The video starts off out of sync, the image is slow, and the degree to which the audio is out of sync increases over a chat session. Over several minutes, the video will end up being five minutes or more out of sync, so that if my buddy gets up from his desk, I will not see this on the video for several minutes even though the audio is in real time. When video chatting, iChat's use of RAM goes from about 90 MB to 110 MB and it's use of CPU goes to 100% of the CPU time.
If I look at capabilities in Connection Doctor, video effects and background effects are not available and the good doctor tells me I have insufficient CPU.
I had no problems with video in OS 10.4 and the one buddy with whom I am chatting has no problem otherwise with video on his end (running 10.5 on an iMac that has Intel chips).
This seems to be a somewhat different than anyone else has reported and I have also seen on other threads at least some folks report that their problems have cleared up over the last few days.
Anyone have any ideas what is going?
Thanks!

Have you tried the Combo Version of the 10.5.2 update ?
http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx1052comboupdate .html
This sometimes takes care of hard to pin down issues like this.
If you have also done the Time Machine and Airport Update you may get a message about not being able to Install the Update
7:17 PM Monday; April 28, 2008

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IChat audio fine, video slow and sync drifts

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