Why does castlevania rondo of blood lag?

[dissidia04]

Why my samsung duos 2 supported mixing 2 buttons only although it is multiple touch but when it comes to ppsspp it can only combine 2 buttons at a time even if u press 3-5 buttons only 2 will respond..... is my case similar to ur phones everyone? Or maybe i could suggest in rrquesting it to devs is this possible?? Maybe i can help to something...... im filipino sorry for my long english he he he.....