Last update: 4 August 2017
Slow WebDAV response may appear using Microsoft Windows Vista or Microsoft Windows 7 if "Automatically detect settings" is enabled in the Internet Exporer proxy settings.
A Microsoft Knowledge Base article is available under http://support.microsoft.com/kb/2445570 describing this issue.
When Auto-Proxy detection is enabled, Internet Explorer waits for the detection timeout for each WebDAV request. This will slow down the WebDAV response.
In Internet Explorer, go to Tools / Internet Options , select the Connections tab and click LAN settings .
De-select the option Automatically detect settings .