We have seen several reports recently that Windows 10 does run well on some AMD Ryzen platforms.
We believe it could be some driver issues for motherboards and the processor.
WIndows 8.1 seems to work better with some motherboards. Windows 10 Creators Edition may work on some. It seems to be hit or miss with every chip set being mentioned.
Check motherboards for BIOS updates which in many cases can resolve problems. At the same time check with motherboard vendors for drivers for various components.