come to think of it :
The most obvious impact on game speed is the AA setting you're using for D3D.
Setting it on high filtering, seriously degraded gameplay.
I recall setting the maximum quality "4xs" made it virtual impossible to play with a 2.6ghz/1mb system+GF4200.
Decreasing sampling quality to Quincunx (in combo with anisotropic filters)made it occasionally bog down,
AA of 2x or turning it off all together never caused a problem.
It even gets worse when combining with high anisotropic filter settings.
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