Steam downloads are often heavily cpu bound at higher speeds. I usually max out my 7800x3d at <1.5Gig.

Signing up for a new non-US account works fine.

As soon as I try to login to my US account it bricks the app.

YMMV.

I don't have a timestamp but some of the details were discussed in this panel: https://www.youtube.com/watch?v=mx_C7LkB1Q8

Free version was pretty limited until this release.

Now free version is fully featured and pro version just has some team features and lack of revenue restrictions.

Better multi core utilization. Less cpu use. Less dependency on single threaded performance.