Single WoW (800x600 in low quality settings) takes 54% CPU load @~130 fps

Antivirus (Kaspersky) is disabled, system processes (running) -> 42

Running WoW 4 times (without the huge main window) takes 100% CPU load, 55% RAM and runs @~50 fps. All process priorities are set to 'normal' and each process uses both cores.