As it has been said, Acrobat is not made for using multiple CPUs.
If you need high performance, you might look at other PDF creators, such as the products from PDF-Tools (http://www.pdf-tools.com). And if you don't find exactly what you need, you can talk to these guys…
If you are stuck with Acrobat, what you can do to make it as fast as possible, is to add as much RAM to your computer, as it can handle, and use the fastest possible disk drive for the system disk.
Hope this can help.
Max Wyss.