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From: Nil Geisweiller <ngeiswei@googlemail.com>
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Subject: bug#30735: (no subject)
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Xref: news.gmane.org gmane.emacs.bugs:144280
Archived-At: <http://permalink.gmane.org/gmane.emacs.bugs/144280>

With a bit of tweaking I managed to apply the entire patch to HEAD and 
it works!!!

I get a similar result as yours, 40s with the patch, 10m without. A 
massive speed increase, and IMO completely acceptable given that 
commenting out that many lines is rather rare.

Thanks again!