@pumpkinrat Not sure about settings in the standalone PCSX, but couldn't you change the output res of that pluggin to 1024x768 (seeing as you had it set to 1360x768 anyways) or a res that has something resembling a 4:3 ratio? I set most of my cores to run at 640x480, as that's technically higher than the original res in most cases anyways. Other benefit to the lower res means less stress on the pi, meaning potentially less input lag.
