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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: cc-mode fontification feels random
Date: Fri, 11 Jun 2021 22:48:21 +0300
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Eli Zaretskii <eliz@gnu.org>,  Alan Mackenzie <acm@muc.de>,
>  rudalics@gmx.at,  rms@gnu.org,  emacs-devel@gnu.org
> Date: Fri, 11 Jun 2021 14:42:31 -0400
> 
> Eli, do you see similar results?

With Emacs 27.2 built with -O2, I see the same times as for Alan's
benchmark: between 30 and 50 msec per scroll.  With Emacs 28 built
with -O0, I see times that are roughly double of what you show:
average of 200 msec per scroll.  The factor of 2 wrt a -Og build is
expected, so I think our results are consistent.