Hey there @Hero_Tales! It really depends how “Open” your open world is. If it’s a massive sandbox that you intend to have extremely dense groups of meshes, then you may need to aggressively cull objects past a certain amount in proximity. If the objects are stationary and many are the same, Hierarchical/ Instanced Static Meshes (HISM/ISM) will be necessary. I would only worry about garbage collection unless your loading/unloading is going to be happening very rapidly or your instances are quite dense.
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