shouldn't be to hard. most laptops have specific key's that can send your desktop through the video-out.
use your function key(Fn next to left control) and one of the F-key's.
I know that on mine it's F7. Maybe different for you. but there you should be an icon on it in a different color, wich is the same as your fn key's color.
You will have you entire desktop transferred to the TV though.
It won't lag, either. Sending a video signal to the TV doesn't require any 'thinking', as the graphics were already rendered by your gfx card and were converted into an electric stream which your TV will decode just like it does TV.