When you use System Center 2012 R2 Virtual Machine Manager (VMM 2012 R2) to provision a physical computer as a virtual machine host (also known as bare-metal deployment), it may take longer than expected to install matching device drivers. This can occur because of changes to the driver file-copy process in VMM R2 which trigger multiple polling activities per file, thus increasing the transfer time per file. The more files that are included in the file-copy operation, the more noticeable this symptom may be.
For all the details and a workaround, please see the following:
KB2965415 - Driver file copying goes slowly during bare-metal deployment in System Center 2012 R2 VMM (http://support.microsoft.com/kb/2965415)
J.C. Hornbeck | Solution Asset PM | Microsoft GBS Management and Security Division
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Regardless of which option I pick, it's still painfully slow.
Really looking forward to this being addressed in a future update!