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Power BI dashboards can be optimized for performance by minimizing the number of visuals and complex calculations on each page. Using optimized data models with appropriate aggregations and indexing reduces load times. Implementing best practices in DAX (Data Analysis Expressions) coding, such as avoiding unnecessary nested functions, also enhances performance. Additionally, leveraging incremental data refreshes ensures that only new data is loaded, reducing processing time. Monitoring and analyzing performance metrics regularly helps identify bottlenecks, allowing for continuous optimization of the dashboard.