Interesting, I've literally never seen the game run below 60 fps except when I was streaming, FRAPSing, and watching my own stream all on my PC at the same time. I can see this being considered legitimate to an extent, since it is an official developer-provided setting, but I'm still curious why it caused the odd behavior for me that you don't seem to experience. Next time I run I'll double-check my framerate and see what it looks like.
(edit) However, I am curious to find out - 2bitmarksman, does turning off V-sync not address your issue? I know that Mazei mentioned he had odd slowdown issues before, and he fixed them by turning that off. He didn't mention nofixedstep, so presumably this addressed his issue.
(edit) However, I am curious to find out - 2bitmarksman, does turning off V-sync not address your issue? I know that Mazei mentioned he had odd slowdown issues before, and he fixed them by turning that off. He didn't mention nofixedstep, so presumably this addressed his issue.