1 Try to closed all others webcam applications
2 Try to change Tracking resolution
3 Try to change Compressor
4 try to change FPS multiplication (like didja tell you) - Try to have a little less FPS that your webcam can view for example if Webcam FPS is 30 - try 28 ...
5 Try different webcam driver with all auto features disable ....
6 Try to have last directx 9.0c
7 no other idea for the moment ....