Right, Metellus suggested I post this here so that people can evaluate how I can get the best performance for M2. During sieges, while the camera is panning I have terribly low framerate and don't even bother starting the battles as it is impossible to get anything moving at normal speed, this occurs on large castles and cities while lots of units are present.
AMD Sempron 2400 1.67 GHZ
1.50 GB Ram
Nvdia Geforce 6600 GT 128 meg
Not sure what else I need to put up, anyway, I let the game autodetect my settings, it gives me low texture and effects details, high for everything else.
So what are the ideal settings to stamp out this lag that doesn't allow me to play out the bigger sieges?