Power BI is no different from any other BI tool or database in this respect. One of the most common causes of failure, and certainly the most common cause of complaints, for any BI project is poor report performance. In general, Power BI is extremely fast, even when you’re working with relatively large amounts of data, but if you make a mistake somewhere, write a complex calculation incorrectly, or fail to model your data in the right way, for example, you will end up in trouble. As a Power BI professional, it’s essential that you know how to design for performance, how to troubleshoot your reports when things go wrong, and how to rectify your errors.
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