[Poppler-bugs] [Bug 91248] New: Poppler extremely slow to render certain PDFs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91248

            Bug ID: 91248
           Summary: Poppler extremely slow to render certain PDFs
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: general
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: sb56637 at gmail.com

Hello,

Certain PDFs opened in Evince or Atril using the Poppler backend are extremely
slow to render, to the point of being unusable. This is on a very fast Thinkpad
laptop with a quad-core processor and an SSD. The same PDFs render instantly
using a Windows PDF reader
(http://www.tracker-software.com/product/pdf-xchange-viewer) (running under
Wine!!).

I can't include all of the many files that I've observed this problem on for
privacy/copyright reasons, but I was able to find that most of the ones from
here exhibit the problem:
https://archive.org/details/ualbertaeducationguides
For example, this file is only about 2MB, but it takes many seconds to render
each page:
https://ia600705.us.archive.org/26/items/kindergartencatho11albe/kindergartencatho11albe.pdf
Another small file:
https://freekidsbooks.org/download/103
These particular PDFs are all scanned books, i.e. only images with no actual
text. But I have also observed this same extreme slowness in certain mixed
text/image PDF files.

On the other hand, some long, complex PDFs with images render extremely quickly
with Poppler, like this one:
http://www.pwc.com/gx/en/paying-taxes/pdf/pwc-paying-taxes-2015-high-resolution.pdf

Thanks for looking into this.

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