I too have a VERY SLOW Yosemite download that might take 2 days. AFAIK my Mac is otherwise running perfectly and my network is fast and I think the download should take less than an hour. I'm averaging 40 KB/sec Yosemite download while the rate should be able to reach 2 MB/sec as indicated by speedtest.net and torrents performance. So I'm only getting one percent of the maximum possible rate.
Network connection to Apple's servers for Apple TV videos like Thursday's keynote is excellent.
I have tried the following:
- quit all common Mac apps except Activity Monitor
- reboot VDSL modem/router
- reboot Mac
- pause/resume Yosemite download many times
- try wired connection to Mac as well as Wi-Fi. Both are working fine and capable of 2 MB/sec
- reset Safari (someone said it helped him but I'm not sure why)
- Force Quit process "storeagent" (which does the downloading)
Any ideas?? I am thinking there is a problem at Apple's end, but only a few people seem to be having the slow download issue.
***UPDATE*** ***IT IS WORKING***
The problem has something to do with DNS. My previous DNS settings (on the Mac, not in router) might have been somehow connecting through a part of the internet in Western USA that has a problem (Comcast??), I am in west Canada near Vancouver. I reset the DNS to the public Google DNS settings 8.8.8.8 and 8.8.4.4 and the download is now running about the expected 2 MB/sec. HURRAY!!!!