Why is there a video delay when mirroring through HDMI?

Since I installed Mountain Lion, I am experiencing a delay of about 0.5s on video that is ouput through the HDMI port vs. the image that is showing on my screen.
Not only is it very distracting, since the cursor on the external display lags behind my motion on the trackpad, but the delay between the audio playing through the MacBook's speakers and the video playing on the external display destroys the viewing experience.
I'm wondering if anyone else is experiencing this. It only occured after Mountain Lion.
Sherif

Have the same problem with 42' LG TV. I have tested a few different HDMI cables without any success.

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Why is there a video delay when mirroring through HDMI?

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