Bug 194327

Summary: Okular takes too time to display the content of PDFs while moving fast through many pages
Product: [Applications] okular Reporter: maui.bugzilla <maui.bugzilla>
Component: generalAssignee: Okular developers <okular-devel>
Status: RESOLVED DUPLICATE    
Severity: wishlist    
Priority: NOR    
Version: 0.8.2   
Target Milestone: ---   
Platform: unspecified   
OS: Linux   
Latest Commit: Version Fixed In:

Description maui.bugzilla@mailnull.com 2009-05-27 17:52:21 UTC 
Version:           0.8.2 (using 4.2.2 (KDE 4.2.2), Kubuntu packages)
Compiler:          cc
OS:                Linux (x86_64) release 2.6.28-11-generic

I have Okular installed and up to date from Kubuntu 9.04.

While viewing a PDF document, I do fast scroll down, but okular takes too time (for me) to load each page.
If I go fast backwards through the already preloaded pages, they are displayed correctly the way I expect for.

---> My computer is fast (3Gb RAM and Turion64x2 2Ghz) so I would like an option to pre-load all PDF document at the beginning, so when I move through it pages the first time, I can view its content instantaneously.

Note: I changed Preferences to Memory usage: aggressive, but this option doesn't seems to take effect (after closing and re-opening to let the changes to take effect)

Thanks!
Comment 1 Pino Toscano 2009-05-27 17:57:21 UTC 
> While viewing a PDF document, I do fast scroll down, but okular takes too time
> (for me) to load each page.

Rendering a PDF is not istantaneous, it can take some time with complex documents.

> Note: I changed Preferences to Memory usage: aggressive, but this option
> doesn't seems to take effect (after closing and re-opening to let the changes
> to take effect)

Memory usage refers to the caching strategy, not to the rendering speed (which you nor okular cannot change anyway).

If you don't want to see empty pages, you could try to disable the "background generation" in the permormance settings.
Comment 2 maui.bugzilla@mailnull.com 2009-05-27 18:19:49 UTC 
> Memory usage refers to the caching strategy, not to the rendering speed (which
> you nor okular cannot change anyway).

Ok, what a pity(?-googletranslated) for this situation.

> If you don't want to see empty pages, you could try to disable the "background
> generation" in the permormance settings.

Yes, thanks. This is less responsiveness, but it's better for me because this way I am viewing the PDF's content instead of empty pages.
Comment 3 Pino Toscano 2009-06-06 23:44:05 UTC 

*** This bug has been marked as a duplicate of bug 159409 ***