List memory preallocation

Is this the correct way to preallocate memory in Mojo?

var large_list = List[int](capacity=5)

var large_list = List[int](capacity=5)

Also with what is the memory preallocate (Null, 0,)?
What is the difference between size and capacity?
Does memory preallocation give me a performance improvment in Mojo?

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List memory preallocation

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List memory preallocation

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