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To optimize performance with large datasets, consultants should limit the data imported into Power BI consulting services using filters in Power Query. Choose between DirectQuery and Import modes based on the client's need for real-time updates or historical analysis. Simplify DAX calculations by using measures instead of calculated columns and avoid overly complex formulas. Use Performance Analyzer to identify and address slow visuals or queries. Implement incremental data refreshes to minimize refresh times and manage large historical datasets efficiently. Prioritize optimizing data models by using fact and dimension tables in a star schema.