Looking for a bottleneck i have hit a Brickwall.

Using Gpu-z and Mooo System Monitor i detected that Cpu/Gpu/Memory are hardly used (20% to 50 %).
Nonetheless i still have horrible FPS in Project Reality 1.0 .

I suspect insufficient Texture Fill rates,Shaders etc.

Now assuming this is even possible for my Gtx 260:

Does anyone know of a Program which would allow me to Monitor Things like Texture Fillrate *Loadout* and other more obscure Bottlenecks ?