why i have much more fps when turn nanite off,

, Isn’t it supposed that if I activate nanite everything goes better?

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It’s a bit more complex than that. By default Nanite isn’t better unless you use a lot of meshes with a higher poly count. There is a certain breakpoint when it becomes more worth to run it.

Make sure you have the correct hardware to support it as well: Hardware and Software Specifications | Unreal Engine 4.27 Documentation