[Okular-devel] [Bug 173681] Large PDF pages cause Okular to crawl

[Martin von Gagern]

https://bugs.kde.org/show_bug.cgi?id=173681

--- Comment #14 from Martin von Gagern <Martin.vGagern at gmx.net> ---
(In reply to comment #13)
> there is not much we can do to increase the speed from the Okular side

This bug here is due to the fact that Okilar renders THE WHOLE DOCUMENT into an
off-screen image. Note that bug #185676 (and its duplicates), which was (imho
correctly) resolved a duplicate of this one here, is not about slowness, but
about an out of memory condition. So the fix to both issues would be only
rendering a portion of the PDF file. This might be the portion currently
visible, or might be some set of tiles to help scrolling. In either case,
memory consumption sould go down, and there is a good chance that speed would
go up as well. The Poppler::Page::renderToImage function DOES support rendering
of only a portion of the image. So I'd suggest making use of that, and only if
rendering remasins slow, THEN it is time to bug upstream about this. Until
then, please REOPEN this bug.

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