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For me, setting the ServerName property in httpd.conf fixed the delays (they were up to 10 seconds at worst):

# ServerName gives the name and port that the server uses to identify itself.
# This can often be determined automatically, but we recommend you specify
# it explicitly to prevent problems during startup.
#
# If your host doesn't have a registered DNS name, enter its IP address here.
ServerName 127.0.0.1:80

Source: http://serverfault.com/questions/66347/the-localhost-response-very-slow-why