what should i turn down....without loosing too much sweetness :-) what is AA? what does it do?
AA = Anti-Aliasing
It makes the edges of objects appear more smooth, thus creating a "sharper" image. It taxes the video card more than most things I think. Though that is affected by driver versions and stuff too.
I usually find that in most games I can reduce "Shadows" and get decent FPS gains, without really losing much in the way of overall graphical splendor.
I'm at work, so I can't look at the CoH settings options. But, if there's options for how long dead bodies show, or how many, you can usually reduce those and save a little bit.
Try reducing Shadows if possible, and perhaps reduce AA to a lower number. You'll notice decent FPS gains I'd guess.