Slow logins are seen when logging in via ssh.
In the sshd configuration file, /etc/ssh/sshd_config, set UseDNS to no and restart the sshd daemon.
The following command will also do this:
For sshd, the configuration can be changed useing:
sed -i 's/^#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config && /etc/init.d/sshd reload
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