slow display video source player with aforge

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C#

video

i have some trouble with my video source player taht i use in my project.
display is very slow (lag)..
what happen with mya project?

this is my code..

videoSourcePlayer1.SignalToStop();
videoSourcePlayer1.WaitForStop();
videoSourcePlayer2.SignalToStop();
videoSourcePlayer2.WaitForStop();

VideoCaptureDevice videoSource = new VideoCaptureDevice(webcam[comboBox1.SelectedIndex].MonikerString);

videoSource.DesiredFrameSize = new Size(320, 240);
//videoSource.DesiredFrameSize = new Size(160,120);
videoSource.DesiredFrameRate = 30;



videoSourcePlayer1.VideoSource = videoSource;
videoSourcePlayer1.Start();
videoSourcePlayer2.VideoSource = videoSource;
videoSourcePlayer2.Start();