https://bugs.freedesktop.org/show_bug.cgi?id=51989

Roman Eisele <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |INVALID

--- Comment #14 from Roman Eisele <[email protected]> ---
(In reply to comment #12)
> Maybe the problem is not the export, but the formatting of the document?

Uwe seems to be right here. Following his suggestion, I have tried to export
the same document two or three times successively to PDF format, in order to
separate the preparation (“Umbruch”: page breaking etc.) from the real PDF
export. To make the comparison easier, I have used again my “big book sample”
from comment #7. The results, given in the same table as in comment #7, but
with current LibO versions and in minute/seconds format (easier to read):

                         3.5.7.1    3.5.7.1       3.6.2.2    3.6.2.2
                         1st pass   2nd/3rd pass  1st pass   2nd/3rd pass
=========================================================================
Stage I                  50s        3s            50s        3s
(spinning cursor)
-------------------------------------------------------------------------
Stage II                 5s         2s            4m50s      5s
(progress bar visible,
but disabled)
-------------------------------------------------------------------------
Stage III                1m50s      1m50s         1m54s      1m42s
(progress bar
showing progress)
=========================================================================
Total                    2m45s      1m55s         7m34s      1m50s

So, while it is still true that the 1st pass of the PDF export is far slower in
LibO 3.6.x than in 3.5.x, the 2nd and 3rd passes are equally fast in both
versions -- I consider the difference of ca. 5 seconds as measuring error;
maybe 3.6.2.2. is even a little bit faster, as Thomas has suggested in comment
#8. Nice!

Now it seams reasonable (the LibO documentation is bad here; a developer could
tell us for sure) that stage I and II are related to the document preparation,
i.e. inserting page breaks, maybe collecting font information etc., and that
the acutal PDF export is identical with stage III. So what has become slower in
LibO 3.6.x is very probably not the PDF export, but the formatting of the
document. This _is_ a problem, of course, but a different one, which needs more
testing (*); the current bug report, which assumed that the PDF export has
become slower, can be closed now.

Thank you all very much for your interest and testing!


(*) If somebody else is interested in testing this document formatting time
slowdown, we could collaborate in designing a nice test, executing it on
several platforms and submitting a new bug report for that; just let me know if
you are interested!

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