[okular] [Bug 390135] PDF render is slow

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=390135

Henrik Fehlauer  changed:

   What|Removed |Added

 Resolution|--- |WORKSFORME
 Status|UNCONFIRMED |RESOLVED

--- Comment #8 from Henrik Fehlauer  ---
Closing as WORKSFORME, because it's not reproducible and we cannot determine
whether the version upgrade and/or switch to HiDPI is the problem, or it is
just slow in general.

We can reopen if you have more information.

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[okular] [Bug 390135] PDF render is slow

[Marcel]

https://bugs.kde.org/show_bug.cgi?id=390135

--- Comment #7 from Marcel  ---
(In reply to Christoph Feck from comment #6)
> Marcel, does comment #5 help to resolve the issue?

Sorry, I haven't do the test. But I think it might actually because the figures
in those PDFs contain too many data points. So it takes time to render them as
mentioned in the comments.

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[okular] [Bug 390135] PDF render is slow

[Christoph Feck]

https://bugs.kde.org/show_bug.cgi?id=390135

--- Comment #6 from Christoph Feck  ---
Marcel, does comment #5 help to resolve the issue?

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[okular] [Bug 390135] PDF render is slow

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=390135

--- Comment #5 from Henrik Fehlauer  ---
Thanks. I tried those exact versions, nothing too unsual so far (Poppler is not
the fastest for image-heavy pages – the blurriness you see might just be an
upscaled pixmap shown from the render cache while rendering the actual page).

Nevertheless, this might be a regression either in Poppler (general regression)
or in Okular (HiDPI regression, or by using some of the new features enabled by
a newer Poppler).

Here is what you could try next:

0. Specify a page, zoom level and what you were doing exactly, so we are
talking about the same thing.

1. Figure out what versions of Okular and Poppler were working "extremely fast"
before you upgraded.

2. Test in non-HiDPI mode: In "kcmshell5 kcm_kscreen", set scaling to 1.0 and
relogin.

3. Open https://phabricator.kde.org/D8379#164630, grep for "QT_SCALE_FACTOR",
watch the accompanying video and let us know if you are experiencing a similar
issue (rerendering instead of using the tile cache for HiDPI).

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[okular] [Bug 390135] PDF render is slow

[Marcel]

https://bugs.kde.org/show_bug.cgi?id=390135

--- Comment #4 from Marcel  ---
(In reply to Henrik Fehlauer from comment #3)
> Marcel: It would be great if you could add the version of Poppler in use.
> You can check with "rpm -qi libpoppler-qt5-1".
The Poppler version is attached below:

Name: libpoppler-qt5-1
Version : 0.62.0
Release : 2.1
Architecture: x86_64
Install Date: Mon 22 Jan 2018 10:46:37 PM GMT
Group   : System/Libraries
Size: 534592
License : GPL-2.0 or GPL-3.0
Signature   : RSA/SHA256, Sat 20 Jan 2018 01:58:19 PM GMT, Key ID
b88b2fd43dbdc284
Source RPM  : poppler-qt5-0.62.0-2.1.src.rpm
Build Date  : Sat 16 Dec 2017 12:00:00 PM GMT
Build Host  : build74
Relocations : (not relocatable)
Packager: https://bugs.opensuse.org
Vendor  : openSUSE
URL : https://poppler.freedesktop.org/
Summary : Qt5 wrapper for the Poppler PDF rendering library
Description :
Poppler is a PDF rendering library, forked from the xpdf PDF viewer
developed by Derek Noonburg of Glyph and Cog, LLC.
Distribution: openSUSE Tumbleweed

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[okular] [Bug 390135] PDF render is slow

[Henrik Fehlauer]

https://bugs.kde.org/show_bug.cgi?id=390135

Henrik Fehlauer  changed:

   What|Removed |Added

 CC||rk...@lab12.net

--- Comment #3 from Henrik Fehlauer  ---
Marcel: It would be great if you could add the version of Poppler in use. You
can check with "rpm -qi libpoppler-qt5-1".

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[okular] [Bug 390135] PDF render is slow

[Nate Graham]

https://bugs.kde.org/show_bug.cgi?id=390135

Nate Graham  changed:

   What|Removed |Added

 CC||pointedst...@zoho.com

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[okular] [Bug 390135] PDF render is slow

[Marcel]

https://bugs.kde.org/show_bug.cgi?id=390135

--- Comment #2 from Marcel  ---
(In reply to Oliver Sander from comment #1)
> Cannot reproduce this.  Does it happen with all documents, or only with
> particular ones?

Not all documents for sure. It happens to PDF files with lots of plots, which
may be the reason why it renders slowly (I should not use the word
"ridiculously", it's not that bad).

You may try this document
https://zenodo.org/record/59178/files/flares_splinter_cs19.tar.gz . The link
won't do any harmful things (just a summary of some boring stars).

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[okular] [Bug 390135] PDF render is slow

[Marcel]

https://bugs.kde.org/show_bug.cgi?id=390135

Marcel  changed:

   What|Removed |Added

Summary|PDF render is ridiculously  |PDF render is slow
   |slow|

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