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...are of CPU time was spent inside, of all places, QuickTime itself - but being called from BeginMediaEdits. The BeginMediaEdits/EndMediaEdits calls were wrapped around AddMediaSampleReference calls, but the Apple docs clearly state (http://developer.apple.com/documentation/QuickTime/APIREF/SOURCESI/ addmediasamplereference.htm) that BeginMediaEdits doesn't need to be called in this case. This patch rips out said use of BeginMediaEdits and this speeds up Vorbis file loading by ~20x in iTunes. Enjoy :)” more here: https://sourceforge.net/forum/forum.php? thread_id=1012726&forum_i...