[Okular-devel] [Bug 153675] New: pre-loading doesn't work properly

[Armin Berres]

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http://bugs.kde.org/show_bug.cgi?id=153675         
           Summary: pre-loading doesn't work properly
           Product: okular
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: okular-devel kde org
        ReportedBy: trigger space-based de


Version:            (using KDE KDE 3.96.0)
Installed from:    Compiled From Sources
OS:                Linux

There are two nasty bugs in kpdf which are still present in okular.
https://bugs.kde.org/show_bug.cgi?id=102528 and https://bugs.kde.org/show_bug.cgi?id=147977
I have my memory usage set to aggressive and the following happens:
When I open a document in non-continuous mode the next page is never pre-loaded. When I have a document with large slides I always have a delay of about a second before the slide is completely shown. When I go back one page is cached. If I go back two pages okular must render the page again, even if it was already shown before. I have 1.25G Ram and more than half of it is still free.

In continuous mode things are a bit better: Pages which have been shown are kept in memory don't have to be rendered again and the next page is pre-loaded. But if you go forward more than one page you have the delay again.

My wish: Okular should keep already rendered pages in memory and it should pre-load more than one of the next pages (I wouldn't mind if it'd pre-load 50 pages if there's enough memory). When viewing slides it is not uncommon to switch between slides really fast, which is not really possible right now.