vaibh511 :
I have 22" led monitor ,sometime i think my graphic card is not enough to handle big screen size so reducing the screen size will make games and it's perfomance to increase?
No it wont help.Same frame same pixel same render....
One good rule is to always keep native resolution of your screen,doesn't matter if its 1080p or 1366x768 just play at native resolution and if video card is struggling than lower the settings,details,AA,shadows etc etc
This way you can actually have better graphic than other way around.