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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: A certain unicode character makes -git Emacs eat all the CPU and
 become very slow.
Date: Thu, 05 May 2022 09:11:44 +0300
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 (message from Vladimir Nikishkin on Thu, 5 May 2022 12:03:33 +0800)
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> From: Vladimir Nikishkin <lockywolf@gmail.com>
> Date: Thu, 5 May 2022 12:03:33 +0800
> 
> Notably, this character: ⮮
> In Unicode this is U+2BAE

I see no such problems here, FWIW.  This is with today's master
branch.  What you see is most probably related to the fonts you have
installed on that system.