SSH connection login delay is generally because sshd opens the reverse DNS resolution by default.
Modify the /etc/ssh/sshd_config of the ssh server and change the UseDNS yes to UseDNS no.
However, today I encountered Anonomous Ubuntu, there is still a delay in connecting to the modified server.
Found a solution:
Edit /etc/nsswitch.conf
Find the hosts line and change it to the following This way:
hosts: files dns [NOTFOUND=return]
The test results are good.
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