MacOS ssh implementations slow

[David Abrahams]

It appears that scp transfers to a Linux machine (even a VM running on
the Mac) are about twice the speed of scp's to the Mac.  This is true of
both openssh 5.1p1 (supplied by Apple) and 5.2p1 (built from macports).

Note that I'm not talking about anything having to do with DNS lookup;
these measurements are dominated by raw transfer rate.

  $ time /usr/bin/scp -r user at IP:directory /tmp

MacOS:

real	1m54.649s
user	0m1.879s
sys	0m1.680s

Linux:

real	1m8.447s
user	0m0.400s
sys	0m0.856s

Is this a known issue?  Is there any way around it?  Slow SSH is really
intolerable, since I use it for everything.

Thanks in advance,

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com