Which type of model gives less lag?

So i made these 3 models and i have a question, which one gives less lag if im gonna make a whole terrain whit them, the 1 full part, the 4 parts but on the sides or the union part?

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The one part will be the best optimized out of those. :sunglasses:

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The one part for sure, but if you need the 4 parts/union, I suggest going with the 4 parts instead of a union operation.

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The 1 Part for sure givse less lag, but if you’re going for a hollow square, then the 4 parts.

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My little contribution, to make sure which one has the least weight/lag, export the model and see it in the file properties:

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