How do Power BI developers design data models for performance optimization?

Power BI developers use star schema designs to simplify relationships and enhance query performance. They remove redundant columns, reduce row counts, and aggregate data to optimize datasets. Relationships are carefully configured with appropriate cardinality and direction to avoid performance bottlenecks. Techniques such as calculated measures instead of calculated columns reduce processing loads. Power BI developers implement data compression and partitioning for large datasets. Query folding in Power Query is also leveraged to push transformations to the data source. These techniques ensure that data models remain lean, scalable, and capable of handling complex reporting requirements.