Please don't feed the trolls
This issue is really interesting. Cryostasis supports SM 4.0, hardware PhysX, SLI, X-Fi sound and... not CPU multi-threading ?!

On the other hand, there's not a lot of AI to take care of, so would multi-threading have made a big difference ? I wonder. Performance issues are more likely to be caused by improper PhysX support or resolution and graphical options set a bit too high... This game is as graphics-intensive as it gets, I'm not sure it relies a lot on CPU performance. To look their best and run smoothly, modern games demand an ok CPU and a killer GPU, not the contrary. I'll keep an eye on my task manager though