iPhone 5S 32GB 8.1 PPSSPP issue

[plZHelpMe]

euhm guys, well i have a problem so i knewed about ppsspp and did wanted to have that app of course . so i followed these steps to download it . LINK: youtube.com/watch?v=sgRIRUU6Xqc
so the problem is that the games i run dont run at full speed none of these , god of war ghost of sparta , tekken 6 , daxter and ratchet and clan size matters.... and its very unplayable they run maybe all abouth 20 fps and cant understand what the problem is . are it the games or didnt i downloaded the app good? pls help me someone really want to play games on my iphone 5s

-iphone 5s .
-16 gb.
-non jailbroken

oh ye. if anyone know the best ppsspp game settings for the iphone 5s i would really apreciate it if u will tell it.