Emacs doesn't respond when editing the attached c header file.
Emacs version: 24.4.

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Run emacs with "emacs -Q test.h".
M-x mark-whole-buffer
M-x kill-ring-save
M-x end-of-buffer
M-x yank
Then emacs doesn't respond for about 5 seconds.
M-x scroll-down-command. 
Then emacs doesn't respond for about 5 seconds too.