Hi,
Welcome to the Discussions
If you do a Speed Test what speeds do you get back ?
http://www.speedtest.net/
If the Video Menu says the Camera is Enabled (ticked) and the Show Status items are also ticked in the View menu it will be the Internet Speed iChat sees at any one time.
Try a computer restart first.
I would also try a PRAM reset if the computer restart does not work
Shut down the computer.
Restart it holding down Apple/CMD (or ⌘)+ALT
PR Keys until you have heard three Start Up Bongs.
9:52 PM Sunday; November 7, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"