Followup:
I processed and shipped 27 orders this morning in about 20 minutes.
Last week that would have taken about 2 hrs+
ShipStation is proving to be an incredible investment.
The integration with X-Cart is literally "copy one file to root" + enter your password. And that's it!
They also have very responsive support if you have any questions. I had a few newbie questions and they answered promptly. I am so smart for installing this.