[OuNiS]

Did you run Sh3 Detection Tool?
You can find it in Support folder in main sh3 folder.
Maybe your system is totally under game requirements?


Another way.
When you play a game, and 10-12 fps occured try to switch to windows desktop (by pressing Alt-TAB) and after that back to game. I noticed that sometimes it helps because probably video engine is reseted or sth. Maybe such switching helps you.