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Power BI consultant optimize DAX queries by simplifying calculations and ensuring that data models are structured efficiently. They use aggregation functions, avoid unnecessary relationships, and minimize the use of complex, resource-intensive expressions. Consultants also recommend splitting large calculations into smaller, reusable measures to reduce processing time. By employing performance tuning techniques, such as indexing or using calculated columns sparingly, they ensure that DAX queries run faster, improving the overall responsiveness and performance of Power BI dashboards for end users.