Вот что нашёл на текнете ‘’’
In Windows Server 2012 R2, the performance of VHDs that are optimized through Data Deduplication is fully tested and supported only on VDI workloads. The same performance gains are not guaranteed for non-VDI workloads on virtual machines running Hyper-V; nor does Microsoft offer support for these scenarios in Windows Server 2012 R2.’’’