Post count: 207


Sounds to me like it might be a power supply issue. As a test, open a SNES ROM and start playing. When the slowdown occurs, is there a square rainbow icon in the top right corner of the screen fading in and out? If so then try a higher rated power supply and the issue will (probably) disappear.

I was pulling my hair out trying to get to the bottom of why all SNES roms and certain MAME ROMs (MK2 / UMK3 mainly) were suddenly running like crap, then I noticed the slowdown only occurred when the rainbow icon appeared. I had recently changed to a different power supply so I changed back to the old one again and performance suddenly became perfect! (And no rainbow icon!).

Hope this helps!



Out of interest, which mame emulator are you using to play MK2 and UMK3?