Recently (in the last few days), my installation of IE8 has been taking 15 to 20 seconds to load my home page. Specifically, the sequence of events (as reported by WireShark) is:-

• Browser issues a DNS A query to resolve the home page server's IP address.
• Browser then spends the next 15-20 seconds broadcasting DNS SRV _LDAP._TCP queries, (roughly on a 2 second tick) to which it receives no answer (we have no LDAP servers).
• Browser re-issues the DNS A query and resolves the server's IP address again.
• Finally, the browser issues an HTTP GET for the home page.

Does anyone know why this is happening?

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EDIT:
@Massimo, LDAP query is :-

Domain Name System (query)
  Transaction ID: 0x11c5
  Flags: 0x0100 (Standard query)
  Questions: 1
  Answer RRS: 0
  Authority RRS: 0
  Additional RRS: 0
  Queries
    _LDAP._TCP: type SRV, class IN
      Name: _LDAP._TCP
      Type: SRV (Service location)
      Class: IN (0x0001)