For everyone's information on this email group: http://social.technet.microsoft.com/Forums/en-US/4c72ae27-198f-4751-b0d6-340a11b52bd4/insanely-slow-os-download-in-2012-r2-winpe?forum=configmanagerosd
I am also experiencing this issue. Hopefully a hotfix / work around is released by Microsoft shortly. When you have 150+ replacements coming up - an extra 15-20 minutes to download the OS to the disk really blows out your replacement times. I've also noticed that its slow when downloading driver packages and the MDT 2013 Files package. Regards, Damon ________________________________ CONFIDENTIALITY NOTICE AND DISCLAIMER The information in this transmission may be confidential and/or protected by legal professional privilege, and is intended only for the person or persons to whom it is addressed. If you are not such a person, you are warned that any disclosure, copying or dissemination of the information is unauthorised. If you have received the transmission in error, please immediately contact this office by telephone, fax or email, to inform us of the error and to enable arrangements to be made for the destruction of the transmission, or its return at our cost. No liability is accepted for any unauthorised use of the information contained in this transmission.

