I’ve made this post on blender.community, and someone pointed me out that i should be linked here. So here i am.
To resume it, Array may treat the mesh as full copies instead of clones (linked duplicates), taking a bunch o RAM.
There’s also some comparisons with other methods of do duplicates, and i hope, some tips on better ways to do it.
see the use of hard disk an RAM of each file, like in this example:
to make it clear, here’s the link: https://blender.community/c/rightclickselect/zxfbbc/