What is the key advantage of simplifying and optimizing a DAX formula in Power BI?

The key advantage of simplifying and optimizing a DAX formula in Power BI is that it reduces computational load and speeds up query execution. When DAX formulas are complex or not optimized, they can lead to longer processing times, which can degrade the performance of the reports and dashboards. By streamlining the calculations and removing unnecessary steps, the engine can execute the queries more efficiently. This not only enhances the responsiveness of the reports but also allows for a smoother user experience when interacting with the data. Improved query execution speeds are particularly critical in large datasets, where complex calculations can significantly slow down performance. Thus, optimization directly contributes to better performance overall.