it has been reported on different websites with different lag measurements depending on methodology but in general the lag (time in milliseconds, for an image the tv receives from a source until the time it is displayed on the screen) is around 45-50 ms. I use this tv for gaming and movies. I will say its by far the best I have used aside from plasma for motion and lag. another factor to think about is motion blur which will cause fast action images to be blurry. this tv is virtually free of any of this and by the naked eye I do not detect any. even when I pause a fast scene the image does not get any clearer or sharper like it does on my old Samsung un46b8000