1. In my simple test, new Arnold is much slower on loading scene than previous version, 14s vs 2m10s. It's even much more slower in large scene.
2. When I render with 2 or more volume, the shader is wrong and appearing mosaic grid.
3. In volume vdb file, Velocity channel never work for Motion blur deform displacement , but it's still work with Turbulencefd standard render.
Hope develop team can fix this, thank you so much !