Metal Gear Solid: Peace Walker

[Vaineguardio]

Has anyone besides me noticed that the in game frame rate is locked at 20? I'm getting 60 FPS in cut scene's and 30 in the graphic novel illustrated cut scenes, although I'm pretty sure that 20 FPS is MGS Peace Walker's normal in game operating speed (I own and play it on psp) it'd still be nice to play it at a smooth 30 FPS or more if that is a possibility? (I have tried lowering the graphics settings etc but my frame rate remains the same regardless of high or low settings)