If you are experiencing long delays when using UNC paths or Microsoft office applications it could be because of a slow UNC timeout. Sometimes when an application attempts to open a UNC path like "\\WebDrive\<sitename>\Myfile.doc", the standard LAN redirector can timeout trying to contact \\webdrive server. To get around this you can add an entry in the lmhosts file for WebDrive.
Create a text file named "lmhosts" (no extension) (if it doesn't already exist) with the following line in it:
and place this in c:\windows\system32\drivers\etc.
Then check your NETWORK Connections "TCP/IP properties / Advanced / Wins / Enable LMHosts lookup" and make sure that is enabled.
Then reboot your system to see if UNC access is faster.