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I worked with a customer today who was experiencing extreme delays when using the "Explorer View" in Microsoft Office SharePoint Server 2007 on a Windows 7 machine with Internet Explorer 8. After clicking on either "Actions - Open in Explorer View" or changing the view to "Explorer View", the following message would be shown in the SharePoint Document library pane.
"Please wait while Explorer View is loaded. If Explorer View does not appear, your browser may not support it"
The first delay would last up to about eight (8) minutes and then would prompt for credentials. After the credentials were entered, it took about another five (5) minutes for the explorer view to appear. The delays were taking up to 14 minutes from start to finish - this is unacceptable!!!! The customer was also accessing the sites using "https" and not "http".
After doing a lot of research both internally and via the Internet, we came up with the following procedure that resolves this issue.
Internet Explorer 8 Changes
The following changes will speed up the process to open explorer view
Add the SharePoint site to Trusted Sites
In IE8, click Tools -> Internet Options
Select the Security tab
Select the Trusted sites green check mark
Click the Sites button
Enter the URL (if not already there) in the "Add this website to the zone" field then select the Add button
Select CloseEnable launching programs and files in an IFRAME
While still in the security tab, click the Custom Level button
While still in IE8, click the Connections tab then select the LAN Settings button
Uncheck the following boxes:
Automatically detect settings
Use automatic configuration script
Click OK twice to close Internet Explorer Options
These changes need to be made if you are accessing a site using "https" so it doesn't prompt for your credentials. This information is taken from http://support.microsoft.com/KB/943280
Go to Start -> Run (or Start -> Search Programs and Files) and type in Regedit and press Enter
Locate then click the following Registry subkey
On the Edit menu, point to New then click Multi-String Value
Type AuthForwardServerList and press Enter
On the Edit menu, click Modify
In the Value data box, type the URL of the server that hosts the Web share then click OK
Exit Registry Editor
Reboot the machine
Hopefully this will save others from spending un-due time on searching for the solution and a SPECIAL THANKS to Jeffrey J Blasinski for testing and confirming these steps!