- Yes, not a great as Unity but it's still pretty good especially after they switched to Vulkan over OpenGL. VR performance still could use some work though.
- Yes, PBR materials are fully supported. Actually one of the earlier things in 3D that was implemented, and then imoroved
- Yes, now I don't know if HAVOK has a Godot plugin but there is a Jolt physics plugin that's designed to be plug-and-play, with a few exceptions (it doesn't suppory soft bodies afaik)