[Poppler-bugs] [Bug 106135] New: Pathological case demonstrating massive slowdown

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106135

            Bug ID: 106135
           Summary: Pathological case demonstrating massive slowdown
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: solo at yopmail.com

Created attachment 138921
  --> https://bugs.freedesktop.org/attachment.cgi?id=138921&action=edit
before

>From a bug reported to pdfgrep at https://gitlab.com/pdfgrep/pdfgrep/issues/25

    The original file, before.pdf, took pdfgrep only 7 seconds to search.
    I then decompressed and recompressed the file to produce after.pdf. On
    this new file, pdfgrep now takes 80 seconds to search it. I also tested
    this procedure against some ebooks and found much worse results, such as
    an increase from 4s to 250s.

    It looks like this might be poppler related, since timing pdftotext on the
    files also exhibits a 10x difference in performance. But every other pdf
    viewer (Mac OS X Preview and Skim, mupdf, PDF.js) and parser (mutool,
    podofo, pdf-parser.py, pstotext/ghostscript) I tried doesn't exhibit any
    significant performance difference between these two files.

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