[okular] [Bug 470734] New: Printing is extremely slow (Win10)

[Dirk Hagedorn]

https://bugs.kde.org/show_bug.cgi?id=470734

            Bug ID: 470734
           Summary: Printing is extremely slow (Win10)
    Classification: Applications
           Product: okular
           Version: 23.04.0
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: printing
          Assignee: okular-devel at kde.org
          Reporter: kde-bug at hgdrn.de
  Target Milestone: ---

SUMMARY

Printing is extremely slow in comparison to Adobe's Acrobat Reader, with Okular
(23.04.0) it takes up to 15 seconds per page (not per job, per page!), even on
a Laser Printer that prints up to 30 pages/minute

STEPS TO REPRODUCE
1. Open a PDF with multiple pages
2. Print

OBSERVED RESULT

The laser printer prints first page, pauses up to 15 seconds, prints next page,
pauses 15 seconds, ...
Okular's Print Preview is slow, too. It takes 16 seconds to open the preview
window.

EXPECTED RESULT

The laser printer prints one page after the other without pausing as it does
when I print the same file with Acrobat Reader. Two print jobs with 16 + 18 =
34 pages took more than 7 minutes with Okular where it took about a minute with
Acrobat Reader.

SOFTWARE/OS VERSIONS
Okular: 23.04.0 (installed from Microsoft Store)
Windows:  Win10 Pro
KDE Frameworks Version:  5.105.0
Qt Version:  5.15.9
Printer: Kyocera TASKalfa 3212i (2 MB RAM)

ADDITIONAL INFORMATION

The opened PDF is a password protected file with 16 pages, it's 81 KB
(Kilobytes) small, uses mostly text and some lines. When printing into a PDF
again (using FreePDF), it creates a PDF of nearly 5 MB (Megabytes), that
doesn't use text but bitmaps (one cannot select text anymore with Okular's text
tool).

Assumption: Okular sends (large) rendered bitmaps to the printer (sub system of
Windows) where Acrobat Reader sends (small) texts. The printer cannot store the
whole Okular print job in its RAM and/or has to re-render each page, where the
printer can easily store the whole Acrobat print job in its RAM and is faster
when rendering the given text.

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