Linux: Slow response time using sshd to log in

The MOS document "Slow Login Response From sshd" via article ID 2000698.1 was not what I thought it would be, as I have experienced slow logins with ssh when certain events happen such as server load or network/firewall issues, but I had not figured in how DNS (or RDNS) may take out our ability to log into a server or set of servers.  Read up on this as you never know when it could help you out some day!