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https://issues.apache.org/jira/browse/PDFBOX-4060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16326588#comment-16326588
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Andreas Lehmkühler commented on PDFBOX-4060:
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Thanks for the fast double check
bq. I'm positively surprised about the full cache. I had decided against that
(without ever testing) because I was afraid of it getting huge.
I had the same doubts, but I've checked the memory consumption as well. Both
variants are different but at the end the used memory is nearly the same.
> 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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