I thought that osmesa is the OpenGL software implementation, but that Mesa in general just provides an interface to the 3D rendering hardware?
If I am mistaken, your answer explains why I get such bad framerates with this VirtualBox setup (and the --mesa option), although I notice no slowdown with ParaView 5.4.1 running in VirtualBox.
Does ParaView starting from version 5.5 have different OpenGL requirements compared to version 5.4? If yes, this might help me investigate how to build VirtualBox with better OpenGL support.
Thanks
Patrick