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http://bugs.kde.org/show_bug.cgi?id=158706
Summary: Rendering is much slower than in KPDF
Product: okular
Version: unspecified
Platform: Fedora RPMs
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: PDF backend
AssignedTo: okular-devel kde org
ReportedBy: kde2eran tromer org
Version: (using KDE 4.0.1)
Installed from: Fedora RPMs
OS: Linux
On my machine, Okular's PDF rendering is much slower than with KPDF. This is
especially evident, and disturbing, when flipping pages: in Okular, PgDn can
take a full second, while in KPDF page flipping looks instantaneous.
Tested on a 1.8GHz Pentium M machine running Fedora 8. KPDF is Fedora's 0.5.8
RPM and Okular is SVN built against Fedora's kdelibs4 4.0.1-6.fc8 RPM. Both use
the same Fedora 8 libraries except for kde3 vs. kde4.
The performance gap seems to depend on the document. Here's a random PDF
showing the issue: <http://law.wustl.edu/WULR/84-5/hurtyin.pdf>.
I have Okular configured with "Aggressive" memory usage and background
generation enabled, and I let it sit for a few seconds before pressing PgDn (to
give it time to pre-render the next page), but the response is still often
slow. The system is otherwise idle.
Notably, the PgDn rendering time in Okular isn't constant: it's sometimes very
fast, and sometimes takes a full second. I'm unable to conclusively correlate
this with anything, including the amount of time waited before pressing PgDn.
This might be relevant: when I press PgDn, okular immediately spews this to
stderr:
okular(23524) Okular::Document::requestPixmaps: request id=3 663x948 5
okular(23524) Okular::DocumentPrivate::sendGeneratorRequest: sending request
id=3 663x948 5 async == true
The actual display update happens about a second, and the CPU is at 100%
inbetween.
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