VIRTUAL TEXTURE MAX PPF: 16 (0 or 1 is the fastest - but cause more texture popping, 4 may be good one, in some cases 64, in others 128 or even around 10000 ).VIRTUAL TEXTURE COMPRESSION: ENABLED (or disabled on non-Nvidia GPU, and while not exceeding VRAM).VERTICAL SYNC: OFF (you can try to force it in GPU control panel instead, and then turn on triple buffering in GPU control panel ).
Certain details on id Tech 5 causes problems even on recent GPUs (esp.