More Problems Multicasting With WDS - Windows Server 2012 R2

Hello All!

I am using SCCM 2012 R2 to deploy operating systems which uses WDS. I have successfully configured multicasting to work through SCCM\WDS however the speeds and network utilization are very poor. Using a Windows 2012 R2 server [Dell PowerEdge] with a 1GB nic and clients with a 1 GB nic [Dell Latitudes & OptiPlexs] using Dell WinPE 5.0 drivers from the CAB with boot media. At best I am receiving transfer rates of an 8 GB file of 11%-14% network utilization. The time to transfer the file is about 8 minutes. I would expect to see a lot higher network utilization.

I have a few questions:

1.      Is any using multicasting with WDS or SCCM\WDS on Windows Server 2012 R2 with a 1 GB nic and 1 GB clients receiving a higher network utilization than 11%-14%?
2.      In Windows Server 2012 R2, WDS automatically configures the network profile of 10, 100, 1000 MB. Does anyone know how to determine what profile the multicast transmission is actually in? I am guessing I am in the 100 MB profile instead of 1000 MB, but want to certain.
   1.      wdsutil /get-allnamespaces /details:Clients nor do the performance monitor counters provide that information.
3.      Anyone have any suggestions to improve the transfer speed and network utilization?
   1.      I came across these performance expectations from Microsoft, but they are only for 100 MB clients. I have not found anything for 1 GB clients.
   2.      I also came across this write-up discussing how to read the WDS performance monitor counters. It states that Outgoing Packets/Second (in Bytes): This counter shows the sum of all outgoing data packets (per second) from all multicast transmissions. On a 100 Mbps network, you should expect this number to reach around 12.5 Mbps (for example, 13107200). On a 1 Gbps network, you should expect this number to reach 20 Mbps or more.
      1.  I am assume I should expect a minimum of 20% utilization of a 1 GB, can anyone confirm or deny that?
   3.      The clients are also not taxed on resources.

Any help or suggestions from the community, MVPs, and moderators would be greatly appreciated. I have had a case open with premier support for months and the support teams have been unable to determine why the speeds are what they are nor get them to increase past 11%-14%. We are almost 100% confident our network is not a fault, but still open to suggestions of that front. My theory is that WDS is placing the multicast transmissions in a slower category based on whatever proprietary algorithm Microsoft is now using to determine the network profile.

Thoughts?

-Tony