I don't really know how to even start troubleshooting this. I have docker updates for existing apps that are taking forever (hours). This is happening when trying to install new apps, or apply updates to existing containers. They all appear to get stuck "Pulling fs layer. Downloading ...". A layer of around 200MB size is taking around  20-30 minutes to download, so it's running at something like 100 kbps. But the download speeds everywhere else are absolutely fine, around 600 mbps. 

 

Can anyone suggest how anything I can do to fix it, or any troubleshooting steps to figure out what's happening?

diag please.

check dns server and internet speedtest.

potentail use a docker run and concurent terminal scirpt comand to update more than 1 time.

80% this is due to ISP internet issues and dns....

Thanks for the troubleshooting steps. The problem seems to have resolved itself, but it lasted basically the whole day yesterday. It wasn't a matter of multiple updates -- I usually have no problem letting those finish. But because the speeds were so atrocious, I just left them running, and it took a few hours to get them all finished. And it definitely wasn't a general internet connection issue -- as I mentioned in the OP, I was getting 600 Mbps from inside VMs and inside individual docker containers. But I never even considered DNS issues, since I wasn't getting any kind of errors. I'm not using the ISPs DNS. I use Google as primary and CloudFlare as secondary, but if it happens again, I'll try different ones, and I'll also post the diag

cool, you can also run netprobe to capture spratic ISP data:

https://github.com/bmartino1/netprobe_lite