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Optimizing Power BI dashboard performance starts with reducing dataset size. Use Power Query to filter out unnecessary data before importing. Simplify data models, and use star schemas where possible. Limit the number of visuals per page and avoid complex DAX expressions that slow down processing. Enable query reduction options in Power BI settings to minimize unnecessary queries. Power BI consulting services use DirectQuery or composite models for very large datasets, but ensure this won’t impact performance. Consultants should always test performance using Power BI’s Performance Analyzer to detect bottlenecks and optimize accordingly.