multiplexing messages between nodered server and client ui (node-red ui) see first comment for usage

noderedmultiplex.json

[{"id":"a280b0ca.203e2","type":"ui_template","z":"78b2e9d1.c8c848","tab":"635f39f2.c5f958","name":"","group":"","order":1,"format":"<pre>--{{msg.payload}}--{{msg.sender}}--</pre><br>\nv1:{{v1}}<br>\nv2:{{v2}}<br>\nv3:{{v3}}<br>\n<script>\n(function(scope) {\n    scope.v1=\"\";\n    scope.v2=\"\";\n    scope.v3=\"\";\n    scope.$watch('msg.sender', function(newValue, oldValue) {\n        if((this.msg===undefined)||(this.msg===null)){console.log(\"msg not defined\");return;}\n        switch(this.msg.sender.substr(0,1)){\n            case \"1\":\n                this.v1=this.msg.payload;\n                break;\n            case \"2\":\n                this.v2=this.msg.payload;\n                break;\n            case \"3\":\n                this.v3=this.msg.payload;\n                break;\n            default:\n                console.log(\"not existing case:\"+this.msg.sender);\n        }\n    }.bind(scope));\n})(scope);\n</script>","storeOutMessages":true,"fwdInMessages":true,"x":695,"y":204,"wires":[[]]},{"id":"635f39f2.c5f958","type":"ui_tab","z":"78b2e9d1.c8c848","name":"test","icon":"dashboard","order":"100"}]

If one keep the message shared memory growing in a flow containing node-red ui components, the amount of data exchanged between the server and the client tend to grow. When this size is becoming to big, performance is degrading.
This gist is a small test which is self contained in one flow.
Just copy-paste the json into a clean flow and open the test ui.
Inject values (from the flow ui), open a client debug browser and see the traffic between the server and the client.
Messages are multiplexed and their states are explicitly saved in the client side according to the received message.
One must be careful about making a variable part (random) for the message sender type, else, angular will not detect the change and the user code for saving the incoming message will not be called if the same type is sent twice in a row!