5 seconds for hostname -f and a strange DNS request
Solution 1:
The order in which DNS queries are resolved is based on the contents of /etc/nsswitch.conf. Specifically, the order of the options on the line for hosts
For example, this line will cause your machine to query a server before checking local files:
hosts: dns files
Man page: http://man7.org/linux/man-pages/man5/nsswitch.conf.5.html