Any time an application is launched, all of the information about any
changes that have taken place on any currently-mounted volumes needs to be
written out. This is done by flushing each of the mounted volumes. This
operation normally happens very quickly. However, updating volumes over a
network can sometimes take time if the network is busy. This is not
something that AppleTalk or AppleShare takes care of, but a job that the
Finder does.