This is probably a result of my recent rewrite of curve drawing in V6 to structure data in a way that allows us to use some OpenGL functions more efficiently.
Vector printing doesn’t use OpenGL, but does still use the curve data structures that I set up. There is an alternate way to draw curves with vector output that may make a difference for these Epilog laser printers.
http://mcneel.myjetbrains.com/youtrack/issue/RH-30444
I’ll try to get this implemented and in before the next public build. Since I don’t have an Epilog to test with, I’ll have to rely on you to double check and see if you get any performance improvements.