v1.2.2-774-gf4999bc is the best version of PPSSPP for the LG G Stylo. All latter versions have speed issues and graphical glitches. Especially the latest nightly  as of Jan. 10  2017. Guess it doesn't like Adreno graphics drivers that much. I really wish the developer would make this emulator easier to deal with different hardware configurations.
January 10 2017