On my Samsung laser it does this when I choose transparency as the paper type.
The way you manipulate the firmware is through the print driver.that doesn't seem to make any differnce on this printer. what limited understanding i have of how printers work there is something called firmware installed in the printer itself and figuring out how to manipulate that may help slow this thing down. it also seems to me that there ought to be more than one way of doing it. surely i'm not the only one who has tried to figure this out.