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Power BI’s performance can degrade with complex data models or large datasets, creating challenges for consulting services. Calculated columns, measures, and inefficient relationships can slow down report rendering, especially when using DirectQuery mode. Power BI consulting services must optimize data models and use techniques like aggregations to improve performance, but these efforts are time-consuming. Additionally, client-side rendering can result in slower dashboard performance on lower-spec devices. Ensuring a balance between functionality and performance requires consultants to make trade-offs, often involving significant time investments to design and test optimized solutions, which can increase project timelines and costs.