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https://issues.apache.org/jira/browse/PDFBOX-4060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16328357#comment-16328357
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ASF subversion and git services commented on PDFBOX-4060:
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Commit 1821349 from [~lehmi] in branch 'pdfbox/branches/2.0'
[ https://svn.apache.org/r1821349 ]
PDFBOX-4060: enable caching for all numbers of input colors
> Slow rendering of PDF file with DeviceN jpeg file
> -------------------------------------------------
>
> Key: PDFBOX-4060
> URL: https://issues.apache.org/jira/browse/PDFBOX-4060
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.5, 2.0.8
> Reporter: Tilman Hausherr
> Assignee: Andreas Lehmkühler
> Priority: Major
> Labels: DeviceN
> Fix For: 2.0.9, 3.0.0 PDFBox
>
> Attachments: PDFBOX-4060-Patch.txt, PDFBOX-4060-veryslow.pdf
>
>
> (File submitted by Soon Keong Tan on the user mailing list)
> There is a large jpeg file (5349 x 3806) that uses a DeviceN colorspace which
> in turn is based on CMYK. There's some slowness due to the type0 convert
> function from DeviceN to CMYK, but this is less than 10%. Most time is from
> converting the CMYK to RGB, one pixel at a time. (Because of the DeviceN
> colorspace we can't use bulk conversion, which may or may not be faster)
> jdk: 1.7.0_72
> benchmarks:
> (1) 1.8.13 - 1.5 mins
> (2) 2.0.5 - 6.18 mins
> (3) 2.0.8 - 6.35 mins
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