I did some exploration missions last ngiht, and one thing stood out. In systems with no nebula or massive asteroid belts, my framerate would jump to over 56 fps or even higher. Enter a map with lots of nebula or huge belts, framerate would drop to 12-16 fps.
This isn't SWG. Change the settings on Genesis to either seriously reduce the density of these, or massively reduce the frequencey that maps with them are randomly generated.