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Tilman Hausherr commented on PDFBOX-2092: ----------------------------------------- {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 -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@pdfbox.apache.org For additional commands, e-mail: dev-h...@pdfbox.apache.org