LG G4

[TkSilver]

That is possible, but the far more likely situation is that that is a far older and less accurate version of ppsspp

So at 2x resolution and with less effects being rendered (you could try disabling slower effects and maybe even disabling simulated block transfers) you might be able to run it as smooth if you find the right version of ppsspp.

And there is always the chance your phone does not handle the 64bit code path correctly, the S7 has some issues with how it handles the changes.