The IndexedVolume object i made does auto-instancing also with culling and full matrix optionally, though i do understand why it is problematic to implement auto instancing for a regular THREE scene as default, also the assets would cause multiple unecessary stacks if they don’t consist of a single geometry and material, this is why i added mesh packing.
@Harry the model itself really isn’t optimal itself, a lot triangles in small and thin details. Try merging it first and see how it performs for a low-end device. The mesh packing method i mentioned about does that btw, also merging an asset with multiple materials and textures into one draw call.
It could also help to merge some regions but not all, you could benefit from culling some chunks.