That's quite unusual. If you transfer data via 'scp', is it also slow?
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Actually I've been noticing this for years with many companies.. I copied from softlayer to serverloft for example with the same problem.. now I'm copying about 500 GBs from hetzner to ubiquity server for days now, and it it copied so little ..
I like to use lftp for moving large amount of data on highspeed links. Provided you have a slightly decent CPU, you can run the transfers in parallel and segment them. I've gone from 20Mbps on a single threaded transfer to 400Mbps+
lftp command could look something like:
mirror --parallel=10 --use-pget-n=10 DirectoryName/
Would do 10 files at once, with 10 segments on each.
Works best with FTP to avoid the overhead for many connections, but lftp supports sftp, ftps, and more.