Metal Gear Solid: Peace Walker

[Jimbogs]

Hey.
I've been playing this game for a while with 30 fps thanks to some cheats I've found here. The problem is.. whenever a cutscene comes down, the fps goes as well and the audio keep going nuts.
Is there a fix for this? I know my cpu is not meant for emulators (Core2duo 2.4Ghz) but i've seen people playing with low end machines pretty well.

PPSSPP 1.1.1 here.