We are having performance problems with the multicast task too with FOG 1.5.4 version. In some sites the performance is good but in another ones the performance is vey very bad.
We have two fog servers: the old fog server with 0.30 version and the new one with 1.5.4. We can deploy without problems with the old one (the both servers are in the same vlan and deploy to the same vlans) but with the new one no.
We are testing the net to know which is the problem but without success, but we have noticed that the --mcast-data-address always is the same value and in the old fog server always is different. Can be this parameter the problem?