Shin Megami Tensei: Persona 3 Portable

[ConflictNZ]

Hi guys, trying to figure out what the problem is with this. I'm trying to play P3P and whenever I go into tartarus with 3d the fps seems limited to 20. It says 20/20FPS 100% speed when the counter is on, no matter what settings I change (1x Rendering 5x Rendering etc). I assume something must be limiting it? I've reset the game settings, system settings etc, tried a range of settings. I can't find anything on google about this problem.