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https://issues.apache.org/jira/browse/PDFBOX-2587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14263149#comment-14263149
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John Hewson commented on PDFBOX-2587:
-------------------------------------
VisualVM's top CPU time methods for this file are:
{code}
org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace.toRGBImageAWT() 65,366
ms (49.5%)
org.apache.pdfbox.pdmodel.graphics.color.PDICCBased.loadICCProfile() 63,302
ms (47.9%)
{code}
This PDF file is very strange, it contains 3627 images and renders them over
and over again. This is why we're seeing such a slow rendering.
However, PDFBox could speed things up by caching color spaces which would limit
loadICCProfile() to a single call, rather than thousands. It may also be
possible to bypass the color conversion in toRGBImageAWT() because the embedded
profile is sRGB, which is, I think, the same as Graphics2D already uses.
> PDF takes minutes to convert
> ----------------------------
>
> Key: PDFBOX-2587
> URL: https://issues.apache.org/jira/browse/PDFBOX-2587
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: simon steiner
> Attachments: RamDiskTest1.pdf
>
>
> time java -cp
> lib/jai_imageio.jar:/home/simon/pdf-box-svn/app/target/pdfbox-app-2.0.0-SNAPSHOT.jar
> org.apache.pdfbox.tools.PDFToImage RamDiskTest1.pdf
> real 2m40.462s
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