Array vs instances improving workflow

[Bruno]

Hi, I have a model of a wind turbine blade with an array modifier, after I instanced it twice to get the three arrays you can see next:

What is more efficient in terms of pc resources to have it as I described or applying the arrays and then link the object data?

Thank you

[Okidoki]

The array modifer just produces the result (and properly internally using linking) so why apply and and link afterwards (expect maybe for export)…

Also: simply do a BIG array and watch the memory usage after applying and linking…