Built-in RBNB _Metrics channels can be viewed using RDV or rbnbPlot. In particular watch MemoryUsed, TotalMemory, and SocketRate. The first two will let you see when Java garbage collection events occur which are often a big culprit for unexpected system load. The latter will give you feedback about overall client activity. E.g. with no sinks active you will see the baseline data flow for your sources. Beware of a Heisenberg-like uncertainty principle; the act of fetching _Metrics to look at them will change the _Metrics. Also beware sinks that seem inactive but may actually be status polling etc.