One of the common comments about Dataflows Gen 2 is that the CU cost can be much higher than a similar Gen 1 dataflow. While they do have the same name, they do work quite differently under the hood and different technologies tend to have different costs, there is one key difference between the two in how they are billed.

In dataflows Gen 2 the pricing is relatively simple with the Microsoft documentation stating you are charged per second of the dataflow runtime (I’m over simplifying here, staging and fast copy can complicate this a bit). In dataflows Gen 1 the billing even simpler as it is just the compute time taken by the refresh.