Thanks, acceleration rates was what I was missing. I have not gone to 12000mm/sec2 yet, but am using 8000mm/sec2, finally got reasonable grey scale. The $1 setting I kinda figure out on my own, but it makes a big difference. Went from 1.5 hrs on test print to 18min, happy
Will try the analog/PWM next.
Again, thanks for the help.
I notice that Universal gcode sender paused about 3 times sending a 110k line file. I'm guessing, due to Java garbage collection. I'm assuming picSender does not have that problem?