Performance: transforming a block of elements vs each element

In a scenario of fixed item heigh which approach is more performant? The fixed example shows making each row position: absolute and applying transform: translateY to it. Is it shown in the docs because this is more efficient than applying transform: translateY to the whole block of elements (as shown here )? Is the difference documented anywhere? I want to learn more about performance implications of such details.
An example showing how to implement Fixed in Svelte Virtual
An example showing how to implement Dynamic in Svelte Virtual
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