Query scale-out is a Power BI Premium feature that load balances user queries across multiple dataset read replicas in a pool of Power BI Premium nodes. Essentially, it speeds up query response times for high user-concurrency workloads. Additionally, dataset refresh operations benefit from increased isolation from the read replicas that protect user queries and improve performance.The management of query scale-out in Power BI is highly automated compared to other platforms, such as Azure Analysis Services. Also, adding and removing read replicas is performed dynamically based on live usage.