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Replicating into cluster is slow
I am migrating from a system running master-slave replication with a master and 5 slave servers. I have set up a cluster with 6 nodes and am replicating from the original master into the new cluster in preparation for switching over to the new cluster. The problem I have is the replication into the cluster seems to be slow and it is difficult to catch up when there are more than 4 nodes running. When I had the 5th node it gets behind when the server is added and then doesn't seem to catch up. Is there something that can be done to improve this performance so that I can actually contemplate adding the 6th node?
The master-slave system is running MySQL 5.7 and the new cluster is running XtraDB 5.7.