Disgaea 3: Absence of Justice [BLES00452]

I have the same problem with recompiler. Interpreter working, i can get ingame, but also when the window is active, there is one amount of FPS, when i do it inactive and again active - FPS can fall from 7-9 after main menu, to 0,5-2. Same as loading screen. But when window again inactive - FPS are back to normal.