i've just done a major cleanup of a runtime that was a total mess (whoever came up with the idea to add exclamation points to sort their stuff ahead of others should be shot); complete with renaming of such folders. before the cleanup poser would take forever to start (i used to read slashdot while it was loading). now it is considerably faster. you'd be amazed how many files have bad references, even if you installed everything according to the instructions. there were even some files that had the wrong names for items they needed. nevermind that some things don't even install properly, ending up outside the proper runtime folders. i didn't time the before and after, but the change is so significant that i can really tell (no more slashdot reading :). also, switching between libraries is much faster now that i've grouped things according to how i want them, and combined/renamed folders. i don't think i would have undertaken this effort without the two utilities i mentioned above (though one could do without pboost and do all the moving and renaming in explorer; just that pboost actually shows the thumbnail images which is really helpful if one is not intimately familiar with the items in one's runtime, and it makes on-the-fly switching of runtimes easy).