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Re: Laserjet 2300 - pause between pages

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Grant Taylor <gtaylor@tnetconsulting.net> wrote:
> On 6/28/19 5:31 PM, Computer Nerd Kev wrote:
>> Sounds like a performance issue with the printing preprocessor. I 
>> have similar trouble since upgrading ghostscript a few years ago. 
> 
> I would think that the symptoms would apply to all pages being printed.
> 
> It sounds like the OP is saying that the first page prints quicker. 

In my experience, ghostscript/CUPS seems to process and print pages
one at a time, with a pause if one isn't ready by the time that the
last one printed. On another computer printing with a HP LaserJet
P3005, printing a very large postscript file with "lp" (or directly
from Libre Office, for one example) instead of "lp -o raw" introduces
noticable pauses and less reliability, whereas it prints consistantly
if the original postscript is sent to it without conversion. This is
with an instalation that doesn't suffer the issues with multi-minute
pauses when printing from Firefox, so I think it is normal operation.

The Postscript files for the raw printing were generated by
Ghostscript/CUPS using a "dummy" printer configured identically to
the P3005, but with output going to a file. So I know that the
problem is not less efficiantly constructed Postscript filling up
the printer's memory, but a delay caused by generating the
Postscript on the PC. The Postscript itself must be identical.

>> Run top while printing and I suspect you'll find a "gs" process using 
>> up all of your CPU power.
> 
> I would be far more likely to suspect the CPU power of the printer than 
> any computer built in the last 15 ~ 20 years.

As noted, an update to CUPS or Ghostscript (I suspect the latter, but
have tried changing the versions of both) seemed to reduce the
efficiency of the process significantly. I believe the system has
moved to using PDF internally instead of Postscript, but I remember
looking into this and finding that my problem was still present with
versions using Postscript.

>> If your printer supports Postscript printing, you can send a postscript 
>> file to it directly using "lp -o raw", this should print at full 
>> speed if my suspicions about your problem are correct.
> 
> I actually think that would be worse.  PostScript means the printer's 
> CPU (if it can be called such) has to do all the rendering.  Conversely, 
> doing the rendering in the computer's CPU is almost always faster 
> (especially in the last 15 years).

If the poscript contains lots of images, sending it directly to the
printer can still result in pauses (though I'm not sure if they would
be eliminated by using the normal printing process). My point is that
a large file that prints using "lp -o raw" without pauses, can have
pauses introduced when using "lp", which indicates that the
bottleneck is at the PC rather than the printer.

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Laserjet 2300 - pause between pages asdf <asdf@nospam.com> - 2019-06-28 12:54 +0000
  Re: Laserjet 2300 - pause between pages Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2019-06-28 17:21 +0000
  Re: Laserjet 2300 - pause between pages "Carlos E.R." <robin_listas@es.invalid> - 2019-06-28 20:17 +0200
    Re: Laserjet 2300 - pause between pages Rich <rich@example.invalid> - 2019-06-28 19:43 +0000
      Re: Laserjet 2300 - pause between pages "Carlos E.R." <robin_listas@es.invalid> - 2019-06-28 23:06 +0200
        Canon makes printers sold under the HP brand (Was: Laserjet 2300 - pause between pages) gazelle@shell.xmission.com (Kenny McCormack) - 2019-06-30 18:41 +0000
          Re: Canon makes printers sold under the HP brand (Was: Laserjet 2300 - pause between pages) "Carlos E.R." <robin_listas@es.invalid> - 2019-06-30 22:27 +0200
  Re: Laserjet 2300 - pause between pages not@telling.you.invalid (Computer Nerd Kev) - 2019-06-28 23:31 +0000
    Re: Laserjet 2300 - pause between pages Grant Taylor <gtaylor@tnetconsulting.net> - 2019-06-28 17:55 -0600
      Re: Laserjet 2300 - pause between pages The Natural Philosopher <tnp@invalid.invalid> - 2019-06-29 06:50 +0100
      Re: Laserjet 2300 - pause between pages "Carlos E.R." <robin_listas@es.invalid> - 2019-06-29 12:49 +0200
        Re: Laserjet 2300 - pause between pages The Natural Philosopher <tnp@invalid.invalid> - 2019-06-29 13:49 +0100
      Re: Laserjet 2300 - pause between pages not@telling.you.invalid (Computer Nerd Kev) - 2019-06-30 02:23 +0000
    Re: Laserjet 2300 - pause between pages The Natural Philosopher <tnp@invalid.invalid> - 2019-06-29 06:47 +0100

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