Power BI development company handle large datasets by optimizing data models, using techniques like aggregation, partitioning, and incremental data refresh. They may employ direct query for real-time data access or implement dataflows for pre-processing. These companies also leverage Power BI’s capabilities to ensure efficient performance, even with vast amounts of data, by designing scalable and robust data architectures. Their expertise allows businesses to work with complex datasets without sacrificing speed or accuracy, ensuring that insights are timely and actionable, regardless of the data volume.