Query diagnostics

The query diagnostics tool that is built into Power Query allows us to see additional information related to each operation that Power Query performs. Many times, these Power Query operations will be data refreshes or when data is retrieved the first time; however, Power Query may perform other operations, such as retrieving a list of tables that can be used to source data. The information provided will provide more information on query steps, their duration, and other details that will allow you to understand which parts of the query take the longest time. Query diagnostics run in a trace fashion where the monitor needs to be started and stopped. When query diagnostics is running, it is recording the operations performed by Power Query to help you gain new insights.

There are two types of diagnostics that can be executed: step diagnostics and session diagnostics. Step diagnostics will provide details on only the selected step from a list of steps in the Query...