How can I optimize performance for a project in Unreal Engine with a large number of objects in the scene?

Development Programming & Scripting Blueprint
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How can I optimize performance for a project in Unreal Engine with a large number of objects in the scene?

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LOD.

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I’ve recently been learning about the SignifanceManager. Might want to look into that.
The Significance Manager in Unreal Engine 4 - Prog.World

Here’s a great rundown of ways to optimize:
Unreal Engine Game Optimization on a Budget - Tom Looman

If you’re feeling condifent, maybe look into Mass

Overview of Mass Entity in Unreal Engine | Unreal Engine 5.5 Documentation | Epic Developer Community | Epic Developer Community

Large Numbers of Entities with Mass in Unreal Engine 5 | Epic Developer Community