Stefan Mueller created PDFBOX-5051:
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Summary: Slow rendering for specific PDF file
Key: PDFBOX-5051
URL: https://issues.apache.org/jira/browse/PDFBOX-5051
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 2.0.21
Environment: Amazon Coretto jdk11.0.3_7, OpenJDK 15
Reporter: Stefan Mueller
Attachments: slowpdfbox.pdf
Doing PDF rendering upon the document being attached is rather slow.
It takes 18 seconds on a Core i7 machine with 32 GB of RAM and no maximum being
imposed upon the JVM.
{code:java}
// Code-Platzhalter
System.setProperty("sun.java2d.cmm",
"sun.java2d.cmm.kcms.KcmsServiceProvider");
System.setProperty("sun.java2d.cmm",
"sun.java2d.cmm.kcms.KcmsServiceProvider"); long ms =
System.currentTimeMillis(); try (final PDDocument document =
PDDocument.load(new File("C:\\temp\\1.pdf"))){ ms =
System.currentTimeMillis() -ms; System.out.println("Took " + ms + "
milliseconds for loading"); PDFRenderer pdfRenderer = new
PDFRenderer(document); pdfRenderer.setSubsamplingAllowed(true);
//for (int page = 0; page < document.getNumberOfPages(); ++page)
for (int page = 0; page < 1; ++page) { ms =
System.currentTimeMillis(); BufferedImage bim =
pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);
ms = System.currentTimeMillis() -ms;
System.out.println("Took " + ms + " milliseconds for rendering");
//<--this number have performance impact
String fileName = "c:\\temp\\test.jpg";
ImageIOUtil.writeImage(bim, fileName, 300); //<---this number }
document.close(); } catch (IOException e){
System.err.println("Exception while trying to create pdf document - " + e);
}
{code}
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