I have a Ryzen 3700x / Radeon RX 5700 / MSI 570A-PRO
Running 10.15.2 with opencore
AMD-V activated in BIOS (if not, a kernel panic occurs with parallels)
VirtualBox (Hyper-V) and Parallels Desktop 13 working perfectly, no speed problem at all, 2 cores/4gb ram
The only thing is that Parallels 13 with Windows 10 has to be configured as Ubuntu to avoid freeze in windows logo.
MSI RADEON MECH RX5700 OC
OC 5.3 - Catalina 10.15.2