Originally Posted by ckramme
I am 99% sure that only the newest library is loaded.
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Intially all of the library versions get loaded, however upon the first trash collection, duplicate versions get chucked out leaving you with only running one version of that particular lib. This is why upon log-in you will often see a rather high RAM usage however then it goes down shortly.
To the OP, those "extra" libs are not going to be an issue unless you are extremely tight for disc space or if you are looking to shave an extra few seconds off your log-in time. However if your character is standing Dalaran when you log-in those extra few seconds are not going to make any difference. In the case of disc space, if you are tight on space, you are better off cleaning out your browser's cache and your Recycling Bin/Trash Can as both of those take up far more space than your entire AddOns folder.