Hi,
You are right: channel is only for import converters.
The export converters have a separate thread for each line in dicom.ini, but one thread per line. So my previous post was wrong.
Import converters run on the same thread as the association so if you recieve on 10 threads it will export on 10 threads, hence the channel * to keep a separate channel (which keeps the connection open as long as possible) per thread.
As regards the poor performance I think you are 'choking' the server by opening 10 assocations at once and export converters do not like this. How many cores do you have?
Marcel