Best Practices for Large Assembly Performance

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Inventor 2016
All service packs and hot-fixes installed
I am trying to define a workflow for producing the lightest possible assemblies and have done a lot of research but i still have 3 questions to which i can't seem to find a definitive answer:
1. Is there a difference in the size of the file produced by Derived/Shrink-Wrap/Simplified Part? if so which is the best?
Most of the research i have done seems to point to Shrink-wrap but i just read this thread:
https://forums.autodesk.com/t5/inventor-forum/large-assembly-performance/m-p/6666018#M619203
in which smokes2998 says not to use Shrink-wrap because it slows Inventor down?
2. When using any of the above techniques, i.e. Shrink-Wrap, do you save more memory by creating a SW of each and every assembly and
sub-assembly or is it negligible when compared to creating a few SWs of the higher level assemblies in the Top-Level assembly?
3. This one is hard to explain.
I have two assemblies that represent the same object in different ways:
Assembly 1 contains 4 sub-assembly components and each has a substitute LOD that is a SW part. i created an LOD in Assembly 1 that selects the substitute LOD in each of the 4 sub-assemblies, leaving me with 4 substitute parts in Assembly 1. in the status bar i show 8 occurrences and 9 documents open.
Assembly 2 is identical to Assembly 1 except that it contains the SW parts of the 4 sub-assembly components in Assembly 1. So instead of 4
sub-assemblies, it contains 4 parts. This shows 4 occurrences and 5 documents in the status bar.
My question is: is assembly 2 less memory intensive than Assembly 1 because those numbers are lower? do those numbers affect assembly
performance or am i splitting hairs?
Just you think i am crazy for trying to reduce the memory of a 4 component assembly, i created these assemblies for experimenting with this so i can apply it to the MUCH larger assemblies i normally work with.
I am interested in any answers, comments, suggestions, examples of workflows, etc. even if it's just a comment that i am wasting my time and none of this will increase my performance by a significant margin.