I think I know what it is: you can have the framerate displayed by hitting the numpad "+" IIRC. Though, for some strange reason, hitting the "-" won't remove it, but will make it give numbers around 0, as if you roughly take the FPS and subtract them again (perhaps averaged out somewhere or something). I found that to be very strange, but I think restarting the game or even returning to the menu fixes it, so I didn't worry too much about it. Also, I don't remember it affecting performance for me, and that was on a Celeron 433 MHz with a TNT2 .
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