>>>
>>>I did just that. Here are the results for a 3-4 page report ...
>>>300 DPI = 455 KB
>>>600 DPI = 1463 KB
>>
>>So, at 300dpi it prints at engine speed (8ppm, about 7.5 seconds/page). At 600dpi it's 30-40 seconds per page (takes about 4 to 5 times as long).
>>
>>The file size is about 3.5 times as large. What we're probably seeing is limitations on the LJ4's processor in printing graphics. You could confirm this by printing the report at 600dpi without the graphics.
>
>That is what I did initially. I took out the green bars and put in a horizontal line every 3 detail lines. I don't have file size figures but the speed was similarly slow. I know that the driver is sending data in RAW format so maybe even text at 600 DPI is a lot to process.

That surprises me, a bit. Straight text and lines on an LJ4 should be fast. Do you have any other graphics on the report (e.g. logos)?