Slow initial connection to proxy

We are having a problem where occasionally people using automatic proxy
configuration experience a 10-15 second delay before our homepage loads
(http://www.greynet.net/) after the initial page loads all connections to
the net are fast and normal.

What is the most likely cause of this? It does not occur when users
select manual proxy configuration. This problem occurs in Netscape 3.0
Gold under MS-Win 3.1 and possibly other configurations.

Our automatic proxy configuration file is http://www.greynet.net/proxy.pac
and is very simple (see the end of this message).

function FindProxyForURL(url, host)
{
        if ( dnsDomainIs(host, ".greynet.net") ||
                dnsDomainIs(host, ".1apparel.com") ||
                dnsDomainIs(host, ".steamtrain.com") )

                return "DIRECT";
        else
                return "PROXY squid.greynet.net:3128; DIRECT";
}

*****************************************************************
* Fraser M. Campbell, Hanover, Ontario, Canada N4N 3C4 *
* Email: fraser@greynet.net Phone: (519) 364-6115 *
* http://www.greynet.net/fraser/ *
*****************************************************************
Received on Sat Dec 13 1997 - 13:57:00 MST