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https://issues.apache.org/jira/browse/PDFBOX-5169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18043344#comment-18043344
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Andreas Lehmkühler commented on PDFBOX-5169:
--------------------------------------------

I've stumbled upon this ticket when working on PDFBOX-6036. The current 3.0.x 
version is way much faster than the early release candidates. My recent change 
lowers the memory footprint, but it is still high.

> PDFMerger produces overly large output PDF
> ------------------------------------------
>
>                 Key: PDFBOX-5169
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-5169
>             Project: PDFBox
>          Issue Type: Bug
>    Affects Versions: 2.0.22, 2.0.23
>         Environment: Debian 10
>            Reporter: Jakov Vežić
>            Priority: Minor
>
> Using PDFMerger to combine
> [https://www.dropbox.com/s/kprk7aeggni420c/1.pdf?dl=1]
> with
> [https://www.dropbox.com/s/0h8bced4tm3gppz/2.pdf?dl=1]
> results in an overly large file. The two input files are 1,25 MB and 16,3 MB 
> large, while the output file is just over 400 MB large. The action also 
> consumes about 1 GB of memory. No errors are produced during the merge that I 
> can tell.
> The command is:
> {code:java}
> java -Xmx2500M -jar pdfbox-app-2.0.23.jar PDFMerger 1.pdf 2.pdf output.pdf
> {code}



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