Performance Evaluation reports the number of resolved components, the large assembly threshold, and whether or not Large Assembly Mode is on.
Large Assembly Mode |
Large Assembly Mode is a collection of system settings that improves the performance of assemblies. You can turn on Large Assembly Mode at any time, or you can set a threshold for the number of components, and have Large Assembly Mode turn on automatically when that threshold is reached. Large Assembly Mode usually includes using lightweight components. |
Lightweight components |
Lightweight components have only a subset of their model data loaded into memory. The remaining model data is loaded on an as-needed basis. Assemblies with lightweight components rebuild faster because less data is evaluated. You can manually set single components, subassemblies, or entire assemblies to lightweight mode, or automatically load components lightweight as part of Large Assembly Mode. |
If the total number of resolved components in the assembly is higher than the large assembly threshold but Large Assembly Mode is off, you can turn it on by clicking
Turn on Large Assembly Mode 
in Performance Evaluation.