Tilman Hausherr commented on PDFBOX-4121:

There is no guarantee that the CMYK option makes everything faster. It works 
best when there are many small CMYK Images. (Btw I tried setting a cache, it 
didn't have the improvement witnessed for other issues).

Re the JPEG2000 warning, I didn't get that. We once had a guy who worked on 
some IBM system and he lost his image plugin libraries in the middle of work.

> (-Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true) takes much time
> ------------------------------------------------------------------------------
>                 Key: PDFBOX-4121
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4121
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Rendering
>    Affects Versions: 2.0.8
>            Reporter: savan patel
>            Priority: Major
>              Labels: DeviceCMYK
>         Attachments: 5a55177653dee.pdf
> I have a pdf in which page 1 gets around 45 sec to render when i set the 
> property (-Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true) and 
> without it it takes 20 sec.
> and something weird happens to me. when i don't set this property 
> (System.setProperty("sun.java2d.cmm", 
> "sun.java2d.cmm.kcms.KcmsServiceProvider")) then i get this warning "WARNING: 
> Could not read JPEG 2000 (JPX) image" . is it some jar related warning or it 
> happen to u also?

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