same problem with "MacBook Pro (Retina, 13-inch, Late2013)".
ran perfectly fine and snappy until yesterday when I let it do the update.
now boot time is horrible, after logging in it takes forever to show my desktop and even then it isn't done loading because the search cannot even find "sound" (settings) for example, it just does nothing.
cmon Apple, I did give you this one chance on friday and you seem to **** it up already.
jodelboy
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Luzern, Switzerland