The transmission of DICOM objects to the storescp or imagectn application works but is incredibly slow - about one 512k image per 15-20 seconds.
The problem is most likely related to reverse DNS lookup. When accepting an association, DCMTK attempts to find out the remote system's hostname. This can take some time if the remote system is not known to the local DNS, in particular on Windows systems. Try to start the application with the additional command line option "--disable-host-lookup" (short: -dhl) which was introduced with DCMTK 3.5.0. The problem should disappear then.