An increased amount of polling caused by Modbus groups with duplicate registers.
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Modbus Register Groups cause multiple resisters to be requested in a single query. This can be a very efficient way of collecting data from a device. See this Article for details. However, if a register is repeated (duplicated) within a group it can cause an increased amount of polling.
The screenshots shows a Modbus Register Group with a Requested group poll interval set to 10,000ms, but the misconfiguration is forcing polls at 500ms.
The resolution is simply to avoid such a configuration.