Recently I noticed getting a usable internet connection took a long time after boot-up. After the login screen, I would switch to the desktop and start Internet Explorer. The window was empty for quite some time, but when it showed my frequent webpages everything worked fine.
The installation of SSD cut the boottime. But not being able to instantly go on the internet or check for new messages was slowing me down.
Yesterday I looked at the Network Control Panel\Network and Internet\Network Connections and noticed the Internal Virtual Switch state. It was “Identifying…” for a long time and when it finally got to “Unidentified network” my Internet Explorer was ready for use. So I disabled it and got my usable internet connection right after boot-up. Problem solved!
Hyper-V networking uses virtual switches to connect to physical networks and virtual (VM-VM and VM-Host) networks. The internal virtual switch is used to connect to virtual networks. Whenever I need such a connection I will enable it again. No reboot required, just some patience.
Good read for setting things up yourself: http://social.technet.microsoft.com/Forums/en-US/winserverhyperv/thread/d9fb7866-0fbc-4c06-b8ea-df3c35c75c74/