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https://issues.apache.org/jira/browse/PDFBOX-5809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17843555#comment-17843555
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Andreas Lehmkühler commented on PDFBOX-5809:
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I've sped up {{setHighestImportedObjectNumber}} by caching all keys of indirect
objects throughout the document. On my system the time for saving the first 10
pages went down from 140 to 18 seconds. But that is still 10 times slower that
2.0
> PDDocument#importPage slowed down by factor 1300
> ------------------------------------------------
>
> Key: PDFBOX-5809
> URL: https://issues.apache.org/jira/browse/PDFBOX-5809
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.31, 3.0.2 PDFBox
> Reporter: Marcus Korinth
> Priority: Major
> Fix For: 2.0.32, 4.0.0, 3.0.3 PDFBox
>
> Attachments: image-2024-04-27-18-50-19-199.png
>
>
> We are using the *PDDocument#importPage* Method in our own splitter where we
> split pages from a _SourceDocument_ to a _TargetDocument_. In order to do so
> we first extract the page by using the following code:
> {code:java}
> final PDPage sourcePage = sourceDocument.getPage(pageNumber);
> {code}
> Immediatly afterwards we are calling:
> {code:java}
> final PDPage targetPage = targetDocument.importPage(sourcePage);
> {code}
> This approach worked just fine with *pdfbox 2.0.26*.
> We decided to upgrade to version *3.0.2* since it takles a lot of the
> problems.
> Unfortunately the *PDDocument#importPage* method slowed down by around 1300
> times. In Version *2.0.26* it took 15ms in an average. With the latest
> *3.0.2* it takes 20000 ms in average. That is a huge deal breaker as we
> usually have to split documents which have several thousand pages.
> Note: The same applies when using *PDDocument#addPage*.
> Note: The problem does not appear in *3.0.1*. But we can't use that since it
> has other major problems which breaks our application.
> I have prepared an example document with which you can replicate the issue.
> Due to the file size limitation I had to prepare a WeTransfer-Link for you:
> https://we.tl/t-lfN2wz7cAs
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