Is it hanging or working slowly?
There is not much that can be done to have this run "faster" besides using more processes (up to a certain point of course) until the I/o or cpu is saturated.
Since you're being on a 18.104.22.168 RDBMS version, it might be an idea to see if DMU is faster, this uses for scanning a totally server side.
For more information on DMU, please refer to the below MOS documents:
How to Migrate a WE8ISO8859P1 DB to AL32UTF8 using DMU 1.2 - an example (Doc ID 1546507.1)
The Database Migration Assistant for Unicode (DMU) Tool (Doc ID 1272374.1)
Try with less processes. I wonder if there is not too much contention caused by more processes than you have processors and disk throughput.
Also, as already said, try DMU. It is the recommended tool for 22.214.171.124