See if the discussion in this thread is helpful:
http://forums.isaserver.org/ISA_2004,_IE_and_Proxy_settings/m_2002001015/tm.htm
When you use Internet Explorer on a Windows XP-based computer, Internet
Explorer may take 8 to 11 seconds to open a Web page
http://support.microsoft.com/kb/906650/en-us
Also make sure proxy caching is not disabled:
How to disable automatic proxy caching in Internet Explorer
https://mvp.support.microsoft.com/default.aspx?scid=kb;en-us;271361
Other possible helpful articles:
"Automatically Detect Settings" Does Not Work if You Configure DHCP Option
252
http://support.microsoft.com/kb/307502/en-us
Web Proxy Auto-Discovery (WPAD) may not succeed when Internet Explorer 6
sends a DHCPInform request that includes the class ID of the client computer
in Windows XP
http://support.microsoft.com/kb/905301/en-us
Internet Explorer may delay up to 10 seconds before it starts for the first
time in Windows XP
http://support.microsoft.com/kb/907455/en-us
--
Jon R. Kennedy MS MVP/IE
Charlotte, NC USA
jkennedy2[ at ]carolina.rr.com
"VFisher" <VFisher[ at ]discussions.microsoft.com> wrote in message
news:57C9AA06-9B1C-4E75-B68F-09A54325B5D5[ at ]microsoft.com...
[Quoted Text] > We are using WPAD to get proxy settings from a webserver. On a handful of
> our clients, IE 6 is experiencing a 30 second delay when auto detecting
> the
> proxy settings. I'm trying to figure out why this might be happening.
>
> This is what I've done so far:
>
> 1. I have no DNS issues. I can ping wpad.<fqdn> and it returns the
> correct
> machine.
>
> 2. I can telnet to port 80 of the hosting webserver, type GET /wpad.dat
> HTTP/1.1 and the config file is returned within seconds.
>
> 3. I have cleared temporary internet files and the like.
>
> I was hoping someone has seen this before and could offer some insights
> and/or suggestsions.
>
> Thaniks.
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