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Date: Sat, 21 Jun 2014 13:54:26 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Matthias Apitz <guru@unixarea.de>
Subject: Re: Fwd: USB to parallel for printer HP LaserJet 4mL
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On Sat, 21 Jun 2014, Matthias Apitz wrote:

> Thanks to Hans, the printing works now. But is terrible slow:
>
> printing a 2.9 MByte Postscript file (containing a bit map, because it
> was concerted from a PDF file) gives:
>
> $ ls -l fra.ps
> -rw-r--r--  1 guru  wheel  2951274 19 jun 17:44 fra.ps
>
> $ date ; cat fra.ps > /dev/unlpt0 ; date ; cat fra.ps > /dev/ulpt0 ; date
> Sat Jun 21 11:43:12 CEST 2014
> Sat Jun 21 11:58:48 CEST 2014
> Sat Jun 21 12:14:51 CEST 2014
>
> i.e. takes around 15 minutes, regardeless of the used device, 3.2K per
> second.

USB in the slow mode?  Also, that twenty-year-old printer is probably 
not that fast at rendering PostScript, and likely memory-limited 
besides.  Could be a combination of all three.

Converting the PostScript to PCL at the same resultion and sending that 
could help to compare.  If it's the same speed, blame the USB adapter 
for sending slowly.  If it's faster, blame the onboard PS interpreter 
for interpreting slowly.