Data are in FGDB stores in local HD. For me, the Calculated in Pro is always a pain in... v2 or v3 doesn't change anything. The window still open until I kill Pro to see the result. Like Pro (3,0,0) , for me, can't know the calculations is finished when I'm in a project.
Finally, stop using pro to do calculation. Made in 15 min all my calculations in arcmap on 8 fields where it's impossible in my project with Pro. Same data, the same location.
Try something to do a calculation in Pro for the same data but in a blank project. Work fine, faster than arcmap. I think the problem is that when you have a project (many maps, many layouts) pro is not made for that.