Somebody mentioned V-Synch in the thread above.
I advise you not to mess with you V-Synch settings! Although turning V-Synch off will speed up your framerate a bit, it can also impact the hit detection the FE does. In several instances turning V-Synch OFF resulted in the rubber bullet syndrome. Folks were seeing lots of hit sprites, but not getting kills because the hit detection was messed up. This is all pureley speculation, but several folks reported the problem went away when the ENABLED V-Synch again.
By default, V-Synch is enabled in your card drivers. If you have messed with it, ensure V-Synch is ENABLED, at least for playing AH.
(Somebody sneak into Torque's place and disable V-synch will ya?)

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Lephturn - Chief Trainer
A member of The Flying Pigs
Visit Lephturn's Aerodrome for AH news, resources, and training data.
http://users.andara.com/~sconrad/
"MY P-47 is a pretty good ship
And she took a round coming 'cross the Channel last trip
I was thinking 'bout my baby and lettin' her rip
Always got me through so far
Well they can ship me all over this great big world
But I'll never find nothing like my North End girl
I'm taking her home with me one day, sir
Soon as we win this war"
- Steve Earl