Gradual fps lagging down

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NiftyBoy

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Mar 29, 2001
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firstly, i have a:

Pentium III 866mhz
128mb 133mhz SDRAM
NVIDIA TNT2 Riva 32mb
32-bit at 1024x768
Winblowz ME

k deus ex runs fine for about 15-30 minutes, with an acceptable framerate (20-40), but then it slowly lags down really bad. if i dont move, the fps is fine, but if i do, it goes down to about 5 fps.

any ideas?