PPSSPP lagging on Galaxy S4

[EvgeniZ]

The two options don't affect the performance (or atleast not by a single or two fps).
Instead they only cause graphical issues.

I keep getting around 7-14 FPS with frameskip 3 on Tekken Dark Resurrection.
Without Frameskip it runs smooth at around 20-24 FPS but for some reason at slow-mo gamespeed around 30-60% speed.

There are no big changes if its buffered, non-buffered or GPU rendering, with high or low render resolution,
multithreaded or not, and the CPU Clock doesn't affect it also, only the loading times.
Pretty much all settings get me the same results as above.

Could be the Full HD resolution or bad compatibility for the:
GPU: PowerVR SGX544MP3 (tri-core) @ 480 MHz
CPU: Exynos 5410 Octa-core CPU with 4x1.6Ghz A15 & 4x1.2Ghz A7 (powersaving) cores