for test purposes I have a new partition with Ubuntu 18.04.3. Afterwards I only installed amdgpu pro 19.05 (./amdgpu-pro-install -y --opencl = legacy, rocm), Blender 2.81a and rpr 2.2.1. Under Windows, it takes about 15 seconds with my test scenes in hybrid modes until the first image is rendered in the viewport. Then the view can be turned smoothly.
In this Linux it takes 45 to 60 seconds and each new image build takes several seconds. Blender often crashes too. So working is not possible.
Should I use a different driver?
Amd fx6300 and radeon rx 570
