This is an interesting one for you.
Okay, the problem is with a Windows network drive. There are 6 shared drives on the network and inly the N:\ drive has this problem. Basically, it is slow to open but only if you click on the name of the drive in explorer, if you click the + to the left of the name it opens straight away.
As I said this only happens with the N:\ drive every other drive opens quickly which ever way you open it.
Bit of a head scratcher.
Thanks in advance.