Power BI Slow with SSAS Multidimensional Cube

I don't think that the performance issue is caused by converting MDX into DAX since Direct Query doesn't convert the query. On the other hand Direct Query has many limitations and it is not always recommended.

Two years ago, the Power BI team created a topic for improving Direct Query

I don't think there is a direct solution for a generic case (using SSAS Multidimensional with Power BI), but you must read more about the Direct Query limitations, best practices and use cases.

Referring to the following official documentation, there are some best practices for using Direct Query:

  • DirectQuery best practices

References and Helpful articles

  • Direct Query with Power BI
  • Using and optimizing DirectQuery in #powerbi and #ssas #tabular
  • Using DirectQuery in Power BI
  • Introduction to DirectQuery