I was interested to see how the "Lock Rotation" of concentric mates affects overall performance of large assemblies. In the past, we at my company were told by GoEngineer and other sources that toolbox hardware should all be free to rotate to save computing time (ie. not mating parallel planes to force bolt head orientations, etc.) I compared the rebuild time of a somewhat medium-sized assembly first with all fasteners free to rotate, then with everything locked rotationally. The rebuild time was actually improved with rotation locked, it went from 126.53 seconds 125.10 seconds. This is only a 1.1% decrease in rebuild time, but I wanted to see if the effect dramatically improved rebuild times of huge assemblies with vast numbers of concentric mates.

Is there any quantifiable data with regards to overall performance of assemblies which have all of their concentric mates rotationally locked?

I checked this with a very large assembly and experienced a problem. When I right click on the "Mates" folder in the top-level assembly and select this new option, it sits there loading for between 30-45 minutes and I just kill SolidWorks at that point. Has anyone had any issues with SolidWorks timing out when attempting this in very large assemblies?  (Between 500-1000 components with many toolbox fasteners patterned throughout)