Let's say you get 50 FPS on average in the current settings.
Let's increase the pixel count from 1366x768 to 1080 on the TV.
Here's the formula to guess what the FPS could drop to:
(1366 x 76 / (1920 * 1080) * 50 = 25.2962963 FPS
That's WORST case and rarely hits that number.
Hope this helps,
<span id="INSERTION_MARKER"> I am having a MSI GX660(mobility HD5870, 4gb RAM, core i5-460M). I am planning to buy a full HD LED tv and want to play games on it by connecting my laptop with it. What i want to know is that i used to play games(like bulletstorm,crysis 2 etc) on my laptop on its native resolution i.e.1366*768 with max settings and without any lags,now when i play games on a full HD LED tv,to what extent does it decrease the performance of my graphic card while playing games as i'm having a single mobility HD 5870 in my laptop.