The jerkyness and jittery render. Check the article I linked to, in this clip you can see the difference.
FumeFX is a plugin for 3D Studio Max. It’s the best commercially (Like $400) available smokesim out there.
But, as I said many times before, it’s all about breaking any project down into manageable pieces, and maybe you can’t reproduce the Vulkan-clip fully, but you could absolutely do some amazing stüff, also with Blender.