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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Default compiler optimization level for building dev sources
Date: Fri, 22 Apr 2016 21:40:02 +0300
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References: <87lh45vib7.fsf@wanadoo.es> <m2twita5nc.fsf@newartisans.com>
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To: John Wiegley <jwiegley@gmail.com>
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> From: John Wiegley <jwiegley@gmail.com>
> Date: Fri, 22 Apr 2016 10:56:55 -0700
> Cc: emacs-devel@gnu.org
> 
> One thing I've noticed with 25.0.92 and OS X is that Emacs 25 can be very
> "pausy". That is, I'll do something (even just switch buffers), and suddenly
> Emacs is locked for about 5-10 seconds, with absolutely no indication before
> or after of what is happening.  Maybe it's GC?

Sounds like some idle timer that does some expensive job.