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<base href="https://bugs.freedesktop.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Pathological case demonstrating massive slowdown"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106135">106135</a>
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<th>Summary</th>
<td>Pathological case demonstrating massive slowdown
</td>
</tr>
<tr>
<th>Product</th>
<td>poppler
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>general
</td>
</tr>
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<th>Assignee</th>
<td>poppler-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>solo@yopmail.com
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=138921" name="attach_138921" title="before">attachment 138921</a> <a href="attachment.cgi?id=138921&action=edit" title="before">[details]</a></span>
before
>From a bug reported to pdfgrep at <a href="https://gitlab.com/pdfgrep/pdfgrep/issues/25">https://gitlab.com/pdfgrep/pdfgrep/issues/25</a>
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.</pre>
</div>
</p>
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