Basic configuration:

    (custom-set-variables
     '(desktop-base-file-name "~/.emacs.desktop")
     '(desktop-save-mode t))

The basic steps:  http://lists.gnu.org/archive/html/emacs-devel/2013-11/msg00330.html

Tips for reproducing this bug,

1. Have "large amount" of buffers open - I have around 20 c buffers open
   from ~/src/emacs/trunk/src/

2. Have your .emacs impose some amount of load.  For example, load few
   .el files or add some big chunk of customizations.

ps: Don't ask for a precise recipe.  

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See the attached screenshot - There are 3 png files in the attached .zip
file.

Step-1: 0s
Step-2: Appears around 4.2 sec
Step-3: Appears around 8.0s