lør. 26. dec. 2020 16.35 skrev Mikael Abrahamsson via NANOG <nanog@nanog.org>:

Perhaps there are some issues at other parts of the network that limits
their speeds? I'm in Stockholm, Sweden, with plenty of local CDNs located
just 1-3ms away from me.

That is why. The RTT to the source can not be larger than the minimum buffer size in the transport path. Otherwise the speed will start decreasing.

Since a lot of ISP equipment only has tiny buffers you will generally be unable to get great downloads from sources far away.

The other option is huge buffers which gives you better speed but with buffer bloat issues.

Regards