How is the time before a login prompt is sent controlled?

When I login in to my server using telnet the 'login:' prompt sometimes comes up instantly, sometimes is takes over 10 seconds.

What controls the delay and how can I influence it? TIA
 
Also check if name resolving works properly. If the server can't resolve the client hostname this may account for the delay.
 
When I used 4.8 the login prompt came up in 5 seconds comsistently. In 6.2, on the console, the login comes up instantly or after an increasing delay if login attempts are unsuccessful. How is the login delay controlled? TIA
 
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