Confirming!
Today i'am having this trouble all day. I've changed video quality to very low. And this is my PC conf:
- intel i5 2500
- gtx660
- 8gb ram
- 7200 hdd speed
- win7 64
So, here's a little video, where you can find after 9:00 how game starting to lag. I dont know - can i post links here? So, I'am very sorry if that's not permitted.
http://cybergame.tv/videos/520044-stuttering-and-lagging-view-after-9-00/
Also: I think that problem is in SKS, cause, before i grabbed it - it seems that everything was ok.