Hyper-V 3.0 provides several performance, scalability, and disaster recovery improvements over previous versions. New features include Hyper-V Replica for replication between sites, VHDX and data deduplication for improved storage, and live storage migration for non-disruptive workload mobility. Networking is enhanced with extensible virtual switching, QoS, and multi-tenant isolation using technologies like GRE encapsulation and address rewrite. Management is improved through integration with System Center and PowerShell automation.