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https://issues.apache.org/jira/browse/PDFBOX-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395876#comment-16395876
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Tilman Hausherr commented on PDFBOX-2092:
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{quote}with a call to PDResources.getXObjects taking roughly half of that and
PageDrawer.drawImage taking the other half.
{quote}
That's the double decoding, which has been fixed in PDFBOX-3340.
Re the code by Petr: I believe something like this has been done in
PDFBOX-3791, see "compromise between memory and time usage" code comment.
Re the patch by Petr: I haven't tested it due to the problems I mentioned, and
because there is a new reason for not using it: we avoid the creation of custom
formats, see PDFBOX-3854.
What remains in the profiler is related to the fact that this image is huge.
Subsampling (PDFBOX-4137) can be one solution.
Another mystery is that rendering time for this file in PDFDebugger went up
between 2.0.6 (2017-06-26) and 2.0.7 (2017-10-04). The cause is... PDFBOX-3854
:(
> Very slow rendering of scanned document
> ---------------------------------------
>
> Key: PDFBOX-2092
> URL: https://issues.apache.org/jira/browse/PDFBOX-2092
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.0
> Environment: Win7 x64 EN
> JDK6,JDK7,JDK8
> Reporter: Juraj Lonc
> Priority: Major
> Attachments: PDFBOX-2092.patch, SCAN_20140522_160457490_page2.pdf
>
>
> It takes extremely long to render this file to image.
> Depends on computer but it can take 15s+ to render 1 page.
> When I skip drawing of inserted image /Im0, then rendering is fast. So there
> is something wrong with drawing that image in
> {code}
> PageDrawer.drawImage(Image awtImage, AffineTransform at)
> {code}
> when I comment out line
> {code}
> graphics.drawImage(awtImage, imageTransform, null);
> {code}
> then rendering process takes 6s
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