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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#42522: Emacs 27: 100% CPU when setting mode-name with ligatures
Date: Sat, 25 Jul 2020 20:27:53 +0300
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To: Robert Pluim <rpluim@gmail.com>
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> From: Robert Pluim <rpluim@gmail.com>
> Cc: Evan Moses <emoses@gmail.com>,  42522@debbugs.gnu.org
> Date: Sat, 25 Jul 2020 19:22:19 +0200
> 
>     Eli> It doesn't hang here.  Could this be macOS-specific?  Or maybe the
>     Eli> problem happens only with some fonts?  Does it happen in "emacs -Q"?
> 
> I see this on macOS with -Q, which uses Menlo, but only with emacs-27,
> not master.. I do see an 'Attempt to shape unibyte text' message from
> emacs-27

Then I guess the problem is already solved on master.