Well, a fresh reinstall do a trick. Stable 60 FPS w/ vsync. Now i will try to pinpoint what mod caused such a FPS drop. Thanks for the tips, will try alt-f2. I'm a new to KSP, so i still don't know a lot of things.
0.2 for me is a total disaster. I've got like 15-30 FPS with my [email protected] and GTX680 (KSP installed on SSD). Will try a fresh reinstall. Have a lot of stuff on orbit, hate to lose it. Here some shots w/ sys info in top left corner.