Slow SSH into my MacOSX laptop

I recently upgraded Michelle's old laptop to MacOSX 10.6 (for myself), and noticed it would take excruciating long to ssh or scp into the box. As it turns out, sshd tries to do a reverse lookup of my internal IPs, which fails. I don't know why it takes it so long to realize this (the reverse lookup ought to fail immediately), but I found a simple solution. In /etc/sshd_config, I simply turned off DNS lookups:

UseDNS no