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https://issues.apache.org/jira/browse/PDFBOX-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244287#comment-16244287
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Tilman Hausherr commented on PDFBOX-3988:
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I have created the new issue PDFBOX-3998 with a better title and added you as a
watcher there.
> Performance issue when rendering first page of PDF
> --------------------------------------------------
>
> Key: PDFBOX-3988
> URL: https://issues.apache.org/jira/browse/PDFBOX-3988
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.7
> Reporter: Maciej Matecki
> Attachments: calls.png
>
>
> Let say that you want to generate PNG for all pages in PDF.
> The generation of the first page is really slow, the second one is quite fast.
> For example test PDF contains two same PDF pages.
> First page renders in: ~2000ms
> Second one: ~220 ms
> It looks like for the first page (inv.0) there's 359 ms overhead just for
> creating the font.
> [^calls.png]
> Tried to use other library to perform the same operation with the same pdf
> file and I was able to retrieve BufferedImage of the first (slower) page in
> ~750 ms.
> For the second page the result was almost the same like for the PDFBox.
> It looks like there's the place to improve performance when starting
> rendering the PDF page.
> Or do you have any advices how to improve performance in the example project?
> Test project: https://github.com/mmatecki/pdfboxperformance
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