Just wanted to add the specs of yet another affected system:
Windows 10 home (64 bit)
Core i5 7600k (3.8ghz, also tried OC'd to 4.3)
16 Gigs RAM
MSI z270 Gaming Pro
Sapphire Nitro+ RX Vega 64
VR Compositor eating up 40-50% CPU resources, often pegging my overall CPU at 100% according to task manager. Have tried going through Steam support but getting nowhere - they're just having me uninstall every single application they find in my system reports.