Oracle Forms methods to transfer a file from a database table to the client

What options are there for using Oracle Forms methods to transfer a file from a database table to the client PC where the Forms application is running? So far we have done this with the Webutil_file_transfer. db_to_client method. However, this method is very slow for larger files. We have also tried to read in a file via a Java bean and then retrieve the byte array from the bean using the procedure get_custom_property. However, this does not work either, as the procedure get_custom_property returns a VARCHAR2 and not a BLOB. Could you provide us with further solution suggestions for the