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From: Eli Zaretskii <eliz@gnu.org>
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Subject: bug#28455: 26.0.50; first M-x next-error is very slow
Date: Fri, 15 Sep 2017 15:36:35 +0300
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In-reply-to: <87wp529fv2.fsf@bapiya> (message from Tom Tromey on Wed, 13 Sep
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> From: Tom Tromey <tom@tromey.com>
> Date: Wed, 13 Sep 2017 20:24:49 -0600
> 
> I ran `make' using M-x compile.
> A number of errors appeared.
> 
> The very first M-x next-error took a long time -- 8 seconds by my
> count.
> 
> This seems to happen the first time after each compilation.

Does it have to be a compilation, or visiting a file with the error
messages, putting it in compilation-mode, then invoking next-error
exhibits the same problem?  If the latter, can you post an example
file which could be used to reproduce this?

Also, does the slow 1st time happen in "emacs -Q"?

Thanks.