Game slow.. What can I do?

[ketatrypt]

Hello, I am wondering what I can do with the options, and/or if there is any other tweaks that I should follow to optimize the game to run as fast as it can, while still keeping a reasonable amount of graphic quality..

First my PC specs are:

Win 7 Ultimate 64 bit
Core 2 quad Q8200, (quad core, 2.69ghz)
Nvidia GTS 450 (overclocked model by EVGA)
ASUS P5K motherboard
4gb DDR2 ram.

Most other games I can run on highest quality, although I can understand why this one takes so much power. But I am hoping that maybe people might know some outside tweaks that I haven't done.

So far I have set physX to CPU, and have unparked my CPU.

I have not done anything with the INI file yet.

I am also wondering what the options exactly entail in the game? Which options effect performance for what. Because I think I am bottle necked at my GPU, because it's core is always at 100% usage, while the CPU is no more then 50-60% used..

If there is a way to transfer more workload to the CPU I am all ears! lol..

Thanks!