A co-worker has been complaining for days about his model taking forever to rebuild.  It's a fairly complex model, and he's constantly rolling up and down in the feature tree to add or edit features.  But I don't feel that its so complex that it should take nearly a minute to rebuild.

I suggested to him to look at his feature statistics to find out if there was a feature or two that stood out among all of the others.  He pointed out that in his feature statistics, most of the features that are high on the list are actually suppressed features.  In the process of developing his model, he will create features, and then he may suppress those features and try something completely different to try to get closer to what he is trying to achieve.  He may do this several times before he comes up with the geometry that he likes & that will work.  In the end he will delete the suppressed features when he is completely satisfied (this is a pretty common way to attempt different methods to create tricky features). Therefore, at this point there are quite a few suppressed features still in his tree.

I've been using SolidWorks since 1995.  I may be wrong.  But I don't remember ever seeing suppressed features taking any time to rebuild.  I thought I remembered that all suppressed features were always at the bottom of the list, on the feature statistics.  Am I remembering correctly?  Does anyone know why suppressed features would take any time to actually rebuild?  I'm not saying this is incorrect or that something is wrong (although it doesn't make sense to me).  I'm just looking for an explanation at this point.