The download speed is pitiful.
I started the macOS Sierra download from the app store last night around 10PM and it has only managed to download roughly half by this AM. It is currently predicting over 14 more hours to complete the download.
FWIW I monitor the incoming and outgoing throughput on my AirPort Extreme. With zero other traffic last night, the incoming data was only happening in short bursts of about a second followed by 10-20 seconds with no traffic at all. This was still the case when I checked first thing this AM. Makes me wonder if Apple has the compute/network infrastructure to support these nearly simultaneous, massive roll outs of iOS, tvOS, watchOS and macOS?
Here's what it looks like this AM
View attachment 656256
---GetRealBro
p.s. Other network traffic was normal last night and still is this AM.