anyone know good tweaks to make the game run better

[=XIII=Shea]

Hi guys,i would like to get back into playing CLOD but the game isnt running the best on my machine,does anyone know any tweaks that can be made so the game can run better,also what setting in options in grapics settings is most demanding on a pc?also guys by turning off hypertreading does it make the game run much better on i7 920,thank you all