Just ran some with Fraps running to find the low and high rates...
(my 128 MB 9800 Pro and CAT 4.7's)
1024x768 @ Medium @ 395/380 = Avg: 49.504 - Min: 26 - Max: 122
1024x768 @ Medium @ 405/380 = Avg: 50.091 - Min: 27 - Max: 123
1280x1024 @ High @ 395/380 = Avg: 30.811 - Min: 15 - Max: 80
*EDIT* Decided to record frame rates every second @1024x768 Medium @ 405/380... hehe
25, 38, 36, 54, 50, 32, 31, 32, 48, 108, 109, 68, 63, 55, 62, 66, 72, 57, 40, 36, 36, 53, 31, 39, 45, 61, 53, 53, 52, 43, 56, 64, 39, 58, 63, 50, 45, 39, 34, 38, 36, 27, 32
That equates to...
49% of the time it's over 50 frames per second
60% of the time it's over 40 frames per second
95% of the time it's over 30 frames per second
The low sections are where that one type of monster throws fireballs or whatever they are... one right at the beginning that he runs away from... then you see none on the screen for a couple seconds, then you see the 2nd one where he backtracks and meets up with the first one again... then it's smooth sailing until he goes through a door and leaves the 3rd one behind and finds a 4th one and the 3rd one comes up behind him again... then it's pretty fast again until he meets up with the 5th one at the end.