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[jbartlau (combit - Jochen Bartlau)]

I"d suggest to take a look into the log file . It contains time stamps and may help to find the culprit. See here:

Troubleshooting Guidance

Introduction This article is intended to help you to find and fix errors and issues on your own. It gives you tips on how to best handle a problem that occurs, how to search for the problem, and what to do in what order. If you still need to contact our technical support team, it will help you make the initial preparations to provide as much information as possible. A large attention is paid to the so-called debugging. Debugging in our case means to examine your program live for errors during…

Also, depending on the content of the PDFs, they might result in large temporary files being created. See here:

I Have a Small Background Image – Why Does the Print Process Use That Much Memory?

JPEG or PNG files are often used as a kind of letterhead replacement. In this case a scan of the desired background is inserted into the project to fill the entire page. Even if these background graphics are only a few MB in size, a large increase in memory is evident at the time of printing the project. The reason is that not all printer drivers can handle the JPEG and/or PNG format. In order to make the output usable on all printers afterwards, such files must therefore be temporarily convert…