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(efaq)Emacs takes a long time to visit files

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Why does Emacs take 20 seconds to visit a file?
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   Old versions of Emacs (i.e., versions before Emacs 20.x) often
encountered this when the master lock file, `!!!SuperLock!!!', has been
left in the lock directory somehow.  Delete it.

   Mark Meuer <meuer@geom.umn.edu> says that NeXT NFS has a bug where
an exclusive create succeeds but returns an error status.  This can
cause the same problem.  Since Emacs's file locking doesn't work over
NFS anyway, the best solution is to recompile Emacs with
`CLASH_DETECTION' undefined.