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.
AMD chipset drivers are available from motherboard manufacturers which should improve compatibility. Other device drivers should also be installed for best results. BIOS updates should also be installed.
Drivers on Windows Update are also an option but motherboard vendors support sites are the best bet.