Strange gaming performance in Monster Hunter 3rd HD

[Vitkarus]

The game goes on maximum possible FPS - 30 (in all locations including the village), but sometimes the FPS drops to 26 or rises above than it should be up to 35. And this is happening no matter what happens on the screen. I can fight with a couple of big monsters and FPS will be 30 or stand and stare at the wall and the FPS will be 26.

Device - iPhone 6 iOS 8.1 jailed.
Using the latest version from the official PPSSP repository - Dev Latest v0.9.9.1-1437-g33f31b0. On all other versions including common 0.9.9.1 had the same performance as described above.

Sorry for my english , it's not my native language.