Use instancing for fast rendering of linked object duplicates.

• To enable instancing, select object and set Properties - Object - Armory Props - Instanced Children to the attributes you need. Only the selected attributes can vary between the instances.
• To create duplicate, click Menu - Object - Duplicate Linked (Alt D)
• Parent newly created duplicate to the original object

Examples:

• https://github.com/armory3d/armory_examples/tree/master/instancing
• https://github.com/armory3d/armory_examples/tree/master/animation_instanced