All was running ideal in my RB world,4 seasons PL terrain and ROTJ2 highest definition ,after getting rid of the grafic corruption, and then I decided that the AI was not smart enough for my multiple victorious avatars.So i replaced my RBprefs file with one of the"AI enhancer" and then nothing is OK anymore,for example I get 2 or 3 FPS when the enemies are in the vicinity or total freeze if I padlock on a distant object...even after getting rid of the new rbpref file...Do anyone have an idea of what causes this trouble and how to cure that? thank you for your help.