I've never had a problem with any spiderweb game on any computer on any operating system, going back as far as various exile games on windows 3.1.
Avernum 6 is choppy and painfully slow to respond no matter what settings I use.
Specs:
Intel quad core 2.4 ghz processor
GeForce 260
4 gigs ram
SATA hard drive
My drivers are up to date and the computer runs everything I throw at it flawlessly so I doubt it's a configuration problem on my end, but I'm willing to try any suggestions.