Went to install an OW2 update tonight and it reminded me to catch an example of this for future people having issues with bnet updates:
https://imgur.com/XpzaJOO
That’s what’s happening when you update WoW as well. See that CPU and disk usage? This is one of the reasons why it can take a long time, if you have a weaker CPU or slower HDD/SSD. So it could be triggering thermal throttling for people playing on laptops or pcs with poor cooling, which will slow it down drastically. I was actually kind of surprised to see it using THAT much of my CPU though.