Hatsune Miku Project Diva 2nd

[ThAt_GuY]

I got an iPad Mini with Retina Display it features:

•A7 Processor 1.3 Ghz-1.4Ghz
•PowerVR G6430 Quad Core Graphics
•1GB RAM

At some point in-game I get frame drops than they spike back up than steady out, any ideas why this is happening? Also my ppsspp settings-

•Mode: Buffered rendering
•Rendering resolution: 2x psp
•Vertex Cache
•Fast memory
•PSP Model 2000/3000