TIL that the scp command does not, by default, compress files it transfers, and that you need to add the -C flag to make it do that, and by doing that I have sped up my transfer speed about 40x, and without this knowledge I have probably wasted literally days of my life waiting for things in the past.
Some may say "why are you using scp rather than rsync" and to that I say, rsync has even more ridiculously complicated flags to learn.

@jimbob

No shame because for me I would just get compression with

`tar -czf - somedir | ssh somehost tar -xzf -`

Because yanno . . . .

@MichaelTBacon @jimbob Also avoids walking the tree twice and adding roundtrips. But surely "ssh somehost 'cd somedir; tar xfz -'" there's probably a tar option for that that might be the same with GNU and BSD tar but I've been doing it this way for 30-40 years now except when I had to use "cpio -iforgettheoptions".