Ray,
Its more a gut feeling. I'm usually pretty accurate if the framerate is between 20-50 because of the "jittery-ness" of the visuals.
As far as enabling anything, no. Everything is maxed except the screen res which is at 1024 x 768 @ 32. I have a AMD 2000+. Nothing on my rig is overclocked. I'm running XP with the SP 1 update. Thats it.
Oh and nothing uneccassary is running in the background like Virus protection etc. (which I found can be the cause of pretty bad performance).
-Hump
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"Both the “left” and the “right” pretend they have the answer, but they are mere flippers on the same thalidomide baby, and the truth is that neither side has a clue."
- Jim Goad