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 plus those extra 2 chars to type are a bridge too far for many