speed improvement

[GuilhermeGS2]

I don't think these "options and tweaks for rooted phones" even exist, this is not as an emulator works, just get a better phone. The only thing that can improve PPSSPP's performance futurelly on Android is Vulkan, and it'll work only on supported devices. The current performance of PPSSPP is acceptable, the only the problem is that most Android devices aren't powerful enough to run it through OpenGL.