It seems the 3ds Max 2012 is still processing Skin and Morpher modifiers when their geometry objects are hidden.  So, this quick snippet just toggles the modifiers onoff across the entire scene based on their objects’ visibility.

mapped fn toggleSkinMorph_basedOnVis obj = (
   modA = obj.modifiers
   for m in modA do (
      if classof m == Skin or classOf m == Morpher then (
         m.enabled = not obj.isHidden

toggleSkinMorph_basedOnVis $geometry