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From: Eli Zaretskii <eliz@gnu.org>
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Subject: bug#48871: 27.2; Unusably slow in C# mode
Date: Sun, 06 Jun 2021 21:08:54 +0300
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To: jan <rtm443x@googlemail.com>
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 (message from jan on Sun, 6 Jun 2021 19:00:57 +0100)
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> From: jan <rtm443x@googlemail.com>
> Date: Sun, 6 Jun 2021 19:00:57 +0100
> Cc: Alan Mackenzie <acm@muc.de>, 48871@debbugs.gnu.org
> 
> Looks like strings doing it.

Well, the fact that c-pps-to-string-delim is the hot spot kinda says
that...