PATCHED Freiheit Und Arbeit-for PC
HPN-SSH is a patched version of OpenSSH which increases the size of these buffers. It makes a massive difference to scp transfer speed (see the charts on the site, but I also speak from personal experience). Of course, to get the benefits you need to install HPN-SSH on all your hosts but it's well worth it if you regularly need to transfer large files around.
PATCHED Freiheit Und Arbeit-for PC