TL;DR,
If you’re seeing performance issues scaling with high bandwidth FOG servers that should have the hardware horsepower to make it work, check your NIC settings, especially when virtualized. txqueuelen parameter in Linux can make a huge difference. If it’s virtualized, look into the settings on both the host and the guest.
You should be able to get >10Gbit from your FOG server if you have hardware that will support it. We hit ours with 20 devices this afternoon all pulling 47gb images and the whole shebang was over in 7 minutes.
Solved!