We have Lightweight mode in Assemblies,... so, why not in Parts?
This would be EXTREMELY useful when referencing multi-bodies, Insert parts, split parts, patterned bodies,.. or for imported Mesh bodies... which all take a lot of memory!!
Example:. aka "STL Graphics1" would be a optional lightweight mode of a solid body within a part.
(btw,...if there is a ER for this, please let me/us know?)