We noticed during the stress-test that reducing the number of streams (i.e. connected vlc clients) from about 160 to 30, gradually, solved the delay issue.
the delay so it’s directly connected with the number of clients served by ems server. Maybe this could not be an issue in normal VOD playback of media content, but it is an issue for live streaming, as a delay of 5 or more minutes is not suitable for most live applications.
we’ll procede further with other tests.