[PDFBOX-4491] slow rendering for PDF

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.14
• Fix Version/s: 2.0.15, 3.0.0 PDFBox
• Component/s: Rendering
• Labels: optimization shading shadingpattern
• Assignee: Tilman Hausherr
• Reporter: Padovan Stefano
• Created: 19/Mar/19 17:11
• Updated: 12/Apr/19 14:39
• Resolved: 25/Mar/19 17:26

Description

When rendering the attached PDF page by page, it takes about 2 minutes 30 seconds on my machine.
Attached also the CPU sample of visualVM.

code is as simple as:

PDFRenderer pdfRenderer = new PDFRenderer(pdf);
for (int i = 0; i < pdf.getNumberOfPages(); i++) {
  ImageIO.write(pdfRenderer.renderImage(i), "bmp", new File("image-" + i + ".bmp"));
}