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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Performance issues with long lines in shell mode
Date: Thu, 07 May 2020 19:56:23 +0300
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 (message from David Karr on Thu, 7 May 2020 09:40:55 -0700)
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> From: David Karr <davidmichaelkarr@gmail.com>
> Date: Thu, 7 May 2020 09:40:55 -0700
> 
> If I know that what I'm about to run will create long lines, I generally
> try to remember to pipe it directly to a file and then open that file. That
> goes much faster than letting it output to the shell.
> 
> Is there some mitigation I can configure that will help with this?

Try "M-x toggle-truncate-lines RET".  It doesn't always help, but it's
worth trying.