The response time of a tv is going to depend on how old the LCD tv is .
And what brand name it is, with cheaper or less well known branded LCD tv sets the response time, or latency will vary.
Also how you are connecting the computer to the tv and the cable type you use.
Hdmi uses quiet a high bandwidth for up to a 1920 x 1080p lcd tv.
So the response time, or latency of screen updating is quiet low.
Plasma sets tend to have a better response time.
Any thing around 6 to 8ms GTG rating should be ok to use.