A lot of resources are required to export very large PDF documents. For example, although images in the PDF document are compressed and therefore relatively small, they have to be decompressed before they can be exported. One high-resolution image can easily take up 50 MB or more, which can lead to lengthy processing times where there are a lot of images or for large documents.
The following options are available to solve this problem:
a) Make sure your system has sufficient storage space.
b) Deactivate the export of "images" and "lines as background image" under "Format -- format options" in profile settings in order not to export any graphic images and to keep file sizes smaller.
c) Export the document in stages (pages 1 - 100, pages 101 - 200, etc.). You can set the page ranges you require in the profile options in the index card "Ranges" tab.