Instancing Static Mesh

lot’s of ways to use instancing. here’s an example:
instancing video

yes, great for performance on desktop computers as all instances are basically considered one instance. on mobile, until hardware acceleration starts appearing more commercially, this isn’t really an advantage.

yes, you could use this concept to generate walls, but you’ll need to evaluate the advantage of placing walls in a scene as it’s own actor, vs. generating them as instances within a blueprint.