Dataflows Gen2 is High cost as (Dataflow Standard Compute Capacity Usage CU) in reservation F64

Hi Giadinhvohoa999 

--> Is Dataflow Standard Compute Capacity Usage CU covered under an F64 capacity?

       Yes, Datafllow gen2 workloads consume CUs from your reserved Fabric capacity. So, if you're using F64 capacity it incldues 64Cus., which are used for all compute intensive operations across MS Fabric such as Dataflows standard compute, notebooks, and smenatic mdoel processing. 

--> Which cost items or billing meters are covered by the F64 capacity purchase?

As per F64 capapcity, the follwing billing meters are covered

-Dataflow Standard Compute Capacity Usage CU

-Notebook Compute Capacity Usage CU

-Pipeline Compute Capacity Usage CU

-Semantic Model Processing Capacity Usage CU

-KQL Query Capacity Usage CU

-Real-Time Analytics Capacity Usage CU

-Data Activator Capacity Usage CU

Pls refer this Understand your Fabric capacity Azure bill - Microsoft Fabric | Microsoft Learn

--> What is the maximum number of Capacity Units (CUs) supported by an F64 capacity?

   F64 capapcity provides exactly 64 CUs per hour ., this is a fixed allocation. Kindly go through this accpeted solution  Solved: Understanding Capacity Units (CU) - Microsoft Fabric Community  You will get clarity

Finally I would conclude your Data flow gen2 consuming High CUs becuase, it may have complex transfformations, large volumes,  freiquent refreshes. Please use MSFabric built-in monitoring to identiify peak usage times and high-cost operations.KIndly go through this link Troubleshooting guide - Monitor and identify capacity usage - Microsoft Fabric | Microsoft Learn It may helps you/

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