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https://issues.apache.org/jira/browse/PDFBOX-5091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17278231#comment-17278231
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Tilman Hausherr commented on PDFBOX-5091:
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It's the subsampling. I was able to reproduce that you had a speed advantage in
2.0.20 but no longer after that.
This advantage was "lost" in PDFBOX-4930 by not considering the size of a
subsampled image when making a decision whether or not to reduce interpolation
when scaling up.
> Performance issue when saving PDF to image after upgrading from PDFBox 2.0.20
> to 2.0.21
> ---------------------------------------------------------------------------------------
>
> Key: PDFBOX-5091
> URL: https://issues.apache.org/jira/browse/PDFBOX-5091
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.21, 2.0.22
> Environment: JDK 8 on Windows10
> Reporter: Volker Ullmann
> Priority: Minor
> Labels: regression
> Attachments: single_page.pdf
>
>
> We use PDFBox to save the first page of a PDF as an image to provide a
> preview of the document. These PDFs can be relatively complex as they may
> contain ten thousands of objects, especially map data. The results are still
> fine, but when we upgraded from 2.0.20 to 2.0.21 we had a notable performance
> decrease. Saving the first page of the attached sample document now takes
> nearly 20 sec on my developer machine, compared to 4 sec with 2.0.20.
>
>
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