What driver are you using for vulkan? What GPU?
I believe the open source vulkan drivers are somewhat experimental and still getting significant changes - it may be that with your particular hardware/software combination you get better performance right now from OpenGL.
It might be worth looking at what versions of the drivers (kernel & mesa) your ubuntu has installed - it may be there are later versions available with improvements already.
I believe the open source vulkan drivers are somewhat experimental and still getting significant changes - it may be that with your particular hardware/software combination you get better performance right now from OpenGL.
It might be worth looking at what versions of the drivers (kernel & mesa) your ubuntu has installed - it may be there are later versions available with improvements already.