For example, by disabling them in data in a data model provided by a customer, I was able to reduce the data model size from 300 MB to 30 MB! As Chris Webb explains here, Power BI-provided hierarchies could bloat the size of the data model. Letting Power BI auto-generate date hierarchies is easy but dangerous and limiting. The date field could come from a Power BI-provided date hierarchy or a Date table. Many quick measures, such as time intelligence calculations (YTD, QTD, Period Over Period Change, etc.), rely on a date field. The feature is still in preview, so make sure you enable it in Power BI Desktop from File, Options and Settings, Options, Preview Features. As I explained here, Power BI introduced the highly anticipated Quick Measures feature to avoid writing DAX formula for common measures.
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