It would be very helpful if there was a command that tabulates the rebuild time, number of faces, number of instances, and overall contribution to the total rebuild/update time of an assembly to identify problem parts or subassemblies. Not only would it help identify issues, it could also help quantify how large the problem is. Just generating a table would be helpful, but there are other things that could be done within the GUI to help as well.
I found Solidworks calls this Performance Evaluation, that can be used in various ways to help find and eliminate problematic features or components. It can also change the colour of components in the model view to provide visual feedback and help identify high load/rebuild time components (bright red = high rebuild/face count, dark blue = low rebuild/face count.). I believe it can also be used to read other meta data and sort and colour based upon that (such as a manually added cost).
For example, it is very helpful to find any nuts that when imported didn't have the threads removed, which results in 10000000 faces that need to be rebuilt one by one when you use that nut in thirty five different subassemblies.
