Ok I do not know why people try and play this game when they hover at -1 to 2.
If you are one of those here are a few tips to get better performance.
1 - play in window mode - this can be done duren a game or in menu option sceeen- goto video > resolution tab > window mode
2 - play with sound off - make a short cut of demi god - right click to properties > in the target box at the end of the line after " and make sure you put a space there and type /nosound (no space between no and sound)
3 - put all the settens on low
4 - get rivatuner and max fan speed and over clock ur video card a little not to maxed.
Also when someone in game tells you tis same stuff dont get all upty about it cause it is you that is causen the problems.
If all else fails and this does not work go upgrade your pc instead of playen a game 1/2 assed