The computer image on TV late

and the conclusion to Monica modes: clone or independent configuration for monitors?

It is possible that prevents any technology improvements the video on the TV (such as Perfect Natural Motion Perfect Pixel HD Engine). Try to disable them to log on from the computer.

The TV image is processed in a special way the various improvers, with the result that a delay occurs. In modern models there is a special mode type "computer", but you have a TV of 2008 of the year, maybe this mode is not added.
Read here: forum.ixbt.com/topic.cgi?id=62:14399
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If the problem only in the lagging sound, then you can configure the delay — many software players allow you to do this.