Focus performance issue.

Hi, I am running at 4.1Ghz overclocked CPU, 8gb of ram and a 550ti gfx card so my memory resources are really not limited, i have 2 screens and i like to play games fullscreen in windowed mode so i can switch between the browser on one screen and switch back to my game on the other, i know this option exists but i don't know where it can be set, basically i want my game to still run at full performance even when the game window is not active (focused), whenever i switch back to my browser, no matter what game i can play smooth when the window is focused, when i switch back to the browser my fps goes down so i have to switch back to the game to see everything in realtime, i am pretty sure the option is called something like, decrease performance when window is unfocused or something like that.

the option isn't there :/

yeah thats what i thought too but thats not the option im looking for :/

when i switch back to the browser my fps goes down so i have to switch back to the game to see everything in realtime

Which as far as the the video card, drivers and game is concerned is no different than Alt+Tabbing out of the game. Also has nothing to do with Windows and i there is a setting/option somewhere for that sort of thing (highly doubt it), it would be in the video card's own control panel.

card drivers have nothing to do with windows being focused/minimized etc. so it would be a windows option.. should i record a video to show what i need changed?

its got nothing to do with hardware limitations.. :/ I get flat top fps in every game then when i switch to my browser window on the other screen my fps drops from 250 to even 9...