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https://issues.apache.org/jira/browse/PDFBOX-2727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14378365#comment-14378365
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John Hewson commented on PDFBOX-2727:
-------------------------------------
PDResources isn't the right place to do caching, it needs to be further
downstream. It was explicitly removed in PDFBOX-2370 and I have a patch
in-progress to replace it. I've noticed that caching of color spaces is really
the only think which has a significant impact on performance, so we might want
to start by just caching those, however PDResources isn't the place to do it.
> Cache color space instances
> ---------------------------
>
> Key: PDFBOX-2727
> URL: https://issues.apache.org/jira/browse/PDFBOX-2727
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.0
> Reporter: Petr Slaby
> Priority: Minor
> Attachments: 000435.pdf, PDResources.java.patch
>
>
> I have a PDF from a customer which contains a lot of calls of
> SetNonStrokingColorSpace and SetStrokingColorSpace. Each time, an embedded
> color profile resource is loaded via ICC_Profile.getInstance(InputStream). I
> have attempted to cache the result in PDResources.java as shown in the
> attached patch. For this particular PDF, this change improves the performance
> of PDFToImage from 27 seconds down to 5 seconds (the PDF has two pages). I
> cannot share the customer PDF, so I have attempted to find a similar free
> one. Unfortunately, in my test suite, I did not find anything with a
> comparable improvement. The best example I found is in the attached PDF.
> There the improvement is from 4.9 seconds without caching to 4.1 with caching.
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