According to this post at Jungle Disk, my SSH connections to some servers are stalling (for nearly a minute) because of changes in the DNS resolution in OS X Leopard. The root cause it probably in my router, which I need to dig into. In the short-term, I added OpenDNS to my list of DNS servers and that seems to speed things up considerably.
1 Comment to Why SSH is Slow to Connect on Mac OS X Leopard
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April 6, 2008
I’m adding this which helped resolve this same issue for me.
http://discussions.apple.com/thread.jspa?threadID=1465925&tstart=15