An error occurred while saving the commentKevin Roth commented
In addition to latency, there are also bandwidth related costs to be considered. One example is passing data back from a field site over a cellular m2m link, where bandwidth is paid for by the megabyte. Another example, which I'm specifically running into with the PI Connector for GE e-terraHabitat (HabConnect), is when the resulting snapshot stream is being routed through the OWL Pi Transfer Service (and their data diode network security device) from a SCADA or DMZ Pi server out to a Corporate Network Pi server. The OWL device is purchased based on the expected transfer bandwidth.
I want to add that I find it disappointing that PI Interfaces (including the one for e-terraHabitat) tended to support Exception Deviation settings to pre-filter snapshot data, but that PI Connectors do not support this mechanism. It seems clear that there are many benefits to adding the option to support exception deviation to connectors.