Anybody out there know anything about computer monitors/extended monitor usage to help me out? Not a major issue, just annoying lag.

I've been using extended monitor quite a bit, hooking my laptop up to my 20" Samsung TV. It works and the picture on the TV looks great, but there is some audio/video lag that's driving me crazy.

Streaming videos lag, and the video gets behind the audio so everyone's motions and lips are off, and we all know how annoying that is. Windows lag when you drag them around the desktop on the TV, too. I checked the refresh rates, and they appear to be the same, 60Hz. Any thoughts?