Hyper-V Integration Services provide a set of components that support important functionality and integration between the Hyper-V parent and child partitions, as well as performance enhancements to core virtual machine devices. You should install the Integration Services to ensure the availability of these services in virtual machine deployments. It is also important to install new versions of the Integration Services when updates are released.
from: http://www.virtualizationadmin.com/articles-tutorials/microsoft-hyper-v-articles/performance-tuning/windows-server-2012-hyper-v-integration-services.html
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