Very poor performance getting images from pdf pages

I am attempting to get images from the pages in my pdf document and aspose pdf software is consuming all cpu and taking a very long time.

I have a 27 page pdf that I tested this on, gave up 27 minutes into it with 14 pages processed, 28 images generated.

I can attach source, pdf for you to re-create.

Performance isn't always so terrible, but some pdf files such as the one I'm including really cause problems.