Thanks, Tom. Great detail provided in that EAC post, and it looks like the Sharing team is investigating. We would need more details from Jamal NUMAN to begin to understand differences he's seeing between ArcMap and ArcGIS Pro.
This is an easy assignment for me! Please, have a look on the screenshots below that show the time elapsed in publishing same data with same environment with Pro and ArcMap. Numbers are telling the story!
What do you think?