All of them on my device expirienced graphical corruption with frameskip set even to auto. The only way for me to run any game reliably is to turn off frameskip completely and they all run fine but slower.
The usual reason frameskip in PCSX4ALL can cause glitches is because the PS1 usually renders to two alternating buffers (double-buffering). Or, the game can clear the screen, display a static image like a load screen, and if that happened to be the frame that was skipped, you'll see nothing. Furthermore, games can read back from what was rendered to PS1 VRAM to do visual effects, and if it was a skipped frame, they'll be reading old frames or garbage. There also is no dedicated texture RAM in the PS1 - the VRAM is just a large rectangular area that stores the screen buffers as well as texture memory, which can all be placed arbitrarily or even overlapping!
It's really different from how older non-3D systems render. There's no way to predict these behaviors 100%, so there are always going to be some glitches. The frameskip code is adapted from PCSX Rearmed (the popular PS1 emu for cellphones/arm devices), and it does try to monitor and be intelligent about when to skip.
Because the Dingoo A320 is such a slow device, there will be more frames skipped in 'auto' mode, and it simply increases the chances for gfx glitches to occur. Frameskip setting of '1' will skip every other frame, which really increases the chances of glitches, but is probably the ideal setting for Dingoo A320. For a speed boost, you can disable XA Audio and CDDA Audio in the SPU settings, but you'll lose music in most games.When you're feeling better
: let us know specifically which games become *unplayable* or really glitchy, and where the glitches happen, so we can try to improve the frameskip code.