I am trying to speed up the time it takes to open large assemblies. I always use large assembly mode (my default setting for large assembly mode is anything over 20 parts) and prefer if everything loads in lightweight. However, I can't figure out why specific parts and subassemblies of top level assemblies refuse to open in lightweight. I can right click on the top level assembly and say set resolved to lightweight but some assemblies/parts refuse to open in lightweight to start. Also, some subassemblies and parts refuse to ever go into lightweight even if I click on them and say set to lightweight. What is the cause for this?
Windows 7 x64 Professional
Dell Precision T5500
Dual Quad Core Xeon x5677 @ 3.47 GHZ
12 GB RAM