The processor power can make a big difference. Using a Pentium 75 or slower will often not be adequate for NetMeeting. Use a small video size whenever possible because it's faster and the audio is better. Increase the compression rate for faster speed. Set the compression rate by right-clicking on the video, choosing properties, and using the slider to choose a sharper video or faster frame.
Less movement increases the frame rate since videoconferencing compression is based on movement.
The less you move, the smaller the amount of data that needs to be sent. Less complex images increase the frame rate. You can improve the rate by pointing the camera at a white wall and by adjusting the lighting and the camera. Audio quality also affects the speed. I get an echo of my voice when I videoconference from the remote end.