This will depend heavily on your network infrastructure and how much traffic currently exists on it. The default settings on the QuickTime Conferencing software are considered to be the best optimized settings for that particular network type. The default settings for IP include the JPEG compressor in the small window (120x80) and the frame rate is set to 10 fps. Keep in mind, however, that the frame rate is what QuickTime Conferencing will attempt to acheive. There is no assurance that it was be reached. If you have a fast Internet connection, this rate is more likely. You should test during peak and non-peak load periods to see what is possible on your network.