Two things:
One, ssh adds encryption overhead (I believe), so it will be slower than a non-encrypted transfer (am I wrong here?)
Absolutely. My fileserver is a PentiumPro 200 with 128 MB RAM. scp/sftp file transfers top out at 1.9-2 MB/s
ftp/wget file transfers top out at 7-7.5 MB/s
Two, a friend sucked down a bunch of large files from my machine using SFTP, then scp, and deemed scp much faster.
I find that hard to believe, since the bottleneck is almost always the CPU (unless you have a very fast processor and slow drive). scp and sftp use the exact same encryption, so I can't see where the difference would be. But then, I may not know what I am talking about.
-Roberto
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