SNES Performance Tweaks

[lion2]

Thanks for the new image. Always good to have more tweakable settings. Just to give you a little more info on my issue. Both the Pi's that were tested in my case were Pi Zero W's. Mine would stutter and my friends wouldn't. Games that I tested were Super Mario World for SNES, Sonic the Hedgehod for Genesis, Donkey Kong for Atari 7800, Pitfall for Atari 2600. Those would all stutter.  The only systems that I did not get stuttering were on NES, Gameboy and Sega Master System. I don't expect the games with additional chips to run perfectly, but the games I did test I did expect to run well. The issue also happens with stock retropie.

Also here is a video I recorded showing my issue. 
https://1drv.ms/v/s!Ats-PEwhX9ZLg79SoX2V0wD3Oiij8A


I have a new Pi Zero W arriving today, so hopefully that fixes everything.