We recently upgraded to SCCM Version 2010 from SCCM 1910. Since upgrading the version 2010, we have noticed that the OSD portion of SCCM is taking forever to download and apply the base Windows for our organization. I got together with my networking team and we narrowed it down to a MultiCast vs. Unicast issue. The issue we were experiencing was when SCCM had MultiCast enabled. When we removed the MultiCast option and reverted to Unicast, everything started imaging normally. I work for a community college, so we do re-image lab computers quite frequently, so we would appreciate have MultiCast working again. Everything was working correctly until we upgraded to version 2010 of SCCM. Any assistance on what to further troubleshoot with this issue would be greatly appreciated. Thank you in advance for your assistance.