I'm betting the Xeon rig is too busy keeping Windows 10 fed and happy
and not doing the actual tasks required by the frustrated user efficiently
I would consider updowngrading to Windows 7 Ultimate SP1, or better still Windows Server 2008R2
If the programs/apps and hardware claim to run on Win 7, 8, and 10,
why not run it on 7 ?
and let MS do their own Win 10xxx beta testing Stay clear of Radeon
half baked driver junk nVidia/GeForce are still KING in video cards with solid working drivers
FWIW, I've never had an issue running Vegas 14 or 15 on AMD gear, Win 7 x64
Then again, if you've got some spare cash to buy the latest AMD rig and see if it fares better with Win 10
... we patiently await the outcome