With Power BI, even though the measure was only defined once, it can be used in any visuals in different ways. Each of the totals is accurate and performs quickly. It is the context of how the DAX measure is used that calculates these totals accurately.
Calculated columns are materialized in the .pbix Power BI file extension, meaning that each time you add a calculated column, you are increasing the size of the overall file. Having too many calculated columns will slow performance and will cause you to reach the maximum Power BI data size sooner.