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https://issues.apache.org/jira/browse/PDFBOX-3103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15018318#comment-15018318
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Tilman Hausherr commented on PDFBOX-3103:
-----------------------------------------
I'll retest this again at a later time, although we're now down to a saving of
only 0.18 sec per printing of a complex file.
> Slow performance when printing PDF (fix provided)
> -------------------------------------------------
>
> Key: PDFBOX-3103
> URL: https://issues.apache.org/jira/browse/PDFBOX-3103
> Project: PDFBox
> Issue Type: Improvement
> Components: FontBox
> Affects Versions: 2.0.0
> Reporter: Tomasz Pawlak
> Labels: easyfix, easytest, optimization, patch
> Attachments: RAFDataStream.java, RAFDataStream.java.patch, test.pdf
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> When printing a PDF document (4 pages, 177KB, link below) using command
> {code}
> java -jar pdfbox-app-2.0.0-RC1.jar PrintPDF test.pdf
> {code}
> processing of the document before print takes about 15 seconds on system with
> Core i5-4670 processor.
> Most of the time is wasted on reading font files from system. The reason is
> that the font is read byte by byte in an unbuffered manner. The defective
> code is located in class {{org.apache.fontbox.ttf.RAFDataStream}}, where new
> instance of {{RandomAccessFile}} is created without buffering.
> I prepared a buffer wrapper over {{RandomAccessFile}} that adds buffering to
> {{RandomAccessFile}}. Use of the buffer in {{RAFDataStream}} shortens
> printing time *5 times*, i.e., printing takes 3 seconds instead of 15s.
> The wrapper class is augmented version of a class released at
> https://code.google.com/p/jmzreader/wiki/BufferedRandomAccessFile (Apache
> License 2.0).
> Please integrate provided fix with original source of FontBox.
> PDF document and fix are available at http://1drv.ms/1NsKPFc
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