Actually, ever since the string handling was moved from erlang strings to binary strings in ejabberd community edition, ejabberd's memory performance is equal o

Actually, ever since the string handling was moved from erlang strings to binary strings in ejabberd community edition, ejabberd's memory performance is equal or better than other offerings. Source: Last company I worked for used XMPP as the data channel to and form our data center and IoT/SCADA devices, I oversaw the project of upgrading from a much older version of ejabberd (which used erlang strings) and the much newer community edition ejabberd(which uses binary strings). You can also write a custom module and use ejabberd solely for it's XMPP wire protocol and excellent routing features, but immediately export incoming data from the server to other processes in your stack without ejabberd ever even parsing the incoming XML(in this case we wrote a rabbitMQ ejabberd module which allowed ejabberd to interact with our data center flawlessly), which is what we did and at that point, a single XMPP server was able to handle our entire traffic. Although we obviously used a cluster and HA load balancer for scalability and redundancy.