Hi,we use the Pdfbox-trunkversion to render pdf's, currently we use the version from 12. May 2015.
Today i have done an update to the current version and have test it. It seems to be that it need now much more time to render pdf's, it depends of the size of the pdf.
for example you can try this one: http://cloud.directupload.net/15bu It need five times more then the version from May 2015. regarts, Manfred
