How to make UNC search faster

Microsoft has identified a problem with DFS clients in KB915377.

MUP is utilized to resolve and direct UNC paths, by default MUP uses DFS as
it's first search path before looking at any other redirector. Problems with
DFS will cause a search to hang.

The hotfix for this has no effect (they replaced the Ntlanman.dll with a
newer version)

I've since reverted to the original Ntlanman.dll (un-installed the hotfix
KB915377) and added the following key to the registry until Microsoft can
fix the root cause:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Mup]

"DisableDFS"=dword:00000001

After rebooting, UNC path resolutions were back to normal speeds.