A little rant:
To the cloud infrastructure of MS: I don't know if anyone uses it for anything serious and doesn't complain about severe performance issues not only related to builds, but everything. From administrative sites to hosted environments. I read a lot of excuses mainly saying I should adjust my expectations regarding speed for cloud solutions... Problem is that there are other providers that don't have these issues.
Seriously, you need only to use office 365 if you want to get an impression of bad performance. Because everything is slow.
This is from a location in Europe, but I really doubt there are significantly more performant locations.