Seems strange - there definitely shouldn't be any reduction in FPS just from having a lot of mobs on screen. Even the worst systems can handle a full Chardok/Fear AoE pull graphically if logging and particles are turned off. Might just be some setting that disagrees with your graphics card - I'd just try messing around with graphics settings in game at that point.
Make sure Max Frames Per Second is set to 100 and try enabling/disabling Level of Detail in Options. Also go into the Advanced menu and try enabling/disabling Advanced Lighting, and try messing with the Actor Clip Plane & Shadows sliders and the vertex & pixel shader settings.
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