Here’s a neat tip to speed up the WDS / PxE boot times for your OSD deployments. This should work on pretty much any WDS (and RIS?) servers you have.
Create this in registry on Your PXE WDS Server:
Value: 16384 Dec (Do not use higher value than this!)
((Recommend that you increase this setting in multiples (4096, 8192, 16384, and so on) and that you not set a value higher than 16384.))
Restart WDS Service
Remember the higher value the more risk of packet loss if bad network Connection.
You have to try this out carefully in your network environment.
If experiencing problems, try lower value.