Open With Windows Explorer very slow

I am trying to troubleshoot an issue where some users of our SharePoint environment have problems using the open with windows explorer option in a document library.
For some users this works fine...  the explorer opens quickly and they can manage the documents.
For other users it takes up to 5 minutes before the explorer view opens.  During this time the browser becomes completly unresponsive.
As part of the troubleshooting process I tried taking the UNC path that is shown in the explorer view and tried using the Start -> Run and then entering in the path.   This seems to cause the complete desktop to freeze until the explorer window displays.
This is occuring on Windows XP SP Pro SP2 with both IE6 and IE7.   The desktops are on the same domain as the SharePoint servers.
Any thoughts on next steps?

I had similar issues with WSS 3 and MOSS 2007.  Some users would experience slow load times when using IE8. 
A. The authentication fix for Microsoft included the following:
In HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Services > WebClient > Parameters, add a new Multi-String Value named "AuthForwardServerList".
In the Value data field, add one URL you visit, following by the SharePoint server FQDN on the next line.  Repeat for each URL you are having long wait times for.  In the end, you'll have something like:
https://*.yourdomain.com
sharepointservername.yourdomain.com
https://otherspsite.yourdomain.com
otherspservername.yourdomain.com
The idea behind this is to explicitly tell WebDAV where to first go for authentication.  This cleared up the majority of access speed issues with SP and we were back to sub-second access.
B. Occasionally that access would degrade for some reason for certain users.  Turns out to be MS updates that make changes to IE settings.  We go to IE Options > Advanced Settings tab and hit RESET.  Whatever RESET does fixed the speed
issues with Explorer View.
C.  Users who installed IE9 had major problems where access would take more than one minute to access these document libraries via Explorer View.  And that's one minute for every navigation click.  Double-click on a folder, wait a minute. 
IE9 must have changed the authentication methodology for WebDAV since this was universally experienced for all IE9 users.  MS couldn't provide a resolution on this.  Our fix was to remove the IE9 update and revert back to IE8.  Everything
went back to normal without having to make any changes to the Registry or IE settings.  Doh!

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