I have gotten a number of models from BlendSwap. They all required a lot of work in the area of materials, scaling, modifiers, & other stuff. This I performed by hand.
They are also massive. The # of vertices were: 27.8k, 402k, 733k, 939k, & 1,375k. These are way overkill. I just finished the 1,375k .blend & got it down to 11k with no real reduction in quality. These people have no care how over the top the vertex count is, so this is no surprise.
Starting on the next, the 402k, it had 109 meshes. I want to spend time working on the biggest meshes first, but which are they? The export log file notes the size of everything, but not in a format which can easily used for this purpose.
I just decided to write a separate file as part of the export to capture all measures of each mesh in a .CSV file. I load this into the spreadsheet program I use, sort descending by Position column, now I know where to work first.