TLDR: click video and uncheck autoframeskip, apply leatrix latency fix, disable aero theme win vista/7/8
smoothing 0 = possible if you both have the latency fix installed
1 = 10-90ms
make sure you and your opponent have the SAME smoothing setting, otherwise one of u gets smooth gameplay and the other gets choppy shit
Right click on GGPO, click "Properties".
Click on the "Compatibility" tab.
Checkmark "Disable Desktop Composition.".
When you launch GGPO, it will turn off the aero theme. When you close GGPO, aero theme will be re-enabled.