Apparently there is a bottleneck on Adreno device, as the GPUs drivers are not fully being utilized..
https://github.com/hrydgard/ppsspp/issues/2007
I had a LG G2 to play with, which has the most powerful CPU and GPU combination, yet using PPSSPP it could barely average 1-3 more FPS than my dated Galaxy TAB 2. Anyhow, if you open up any application/game and dont close it, the PSP emulator does see a significant increase in speed. Its hardly a work around but it should help on those devices for the time being
https://github.com/hrydgard/ppsspp/issues/2007
I had a LG G2 to play with, which has the most powerful CPU and GPU combination, yet using PPSSPP it could barely average 1-3 more FPS than my dated Galaxy TAB 2. Anyhow, if you open up any application/game and dont close it, the PSP emulator does see a significant increase in speed. Its hardly a work around but it should help on those devices for the time being