'Dynatrace report show a gap between operation

I am getting from Dynatrace in several part of the application a gap between call that has not significative or no processing between call. The graphic appear so:

Dynatrace gap between call

All the call to the external services have its await and are async. The computer has enough memory and the processing time is not high. The program is itself a service developed on Core 3.1 C#. Thanks in advance



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