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cc-mode: recent performance issues?

From: Yuri D'Elia
Subject: cc-mode: recent performance issues?
Date: Tue, 09 Nov 2021 17:42:48 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

I noticed a relatively recent performance issue in cc-mode.

Try opening the following attached file, which is a random c++ piece of
code containing some template-heavy function repeated multiple times.

In emacs -q -nw, try to scroll down a bit, then up. Emacs gets busy in a
display loop.

Under x11/lucid (emacs/lucid with NATIVE_FULL_AOT=1), it's a bit more
responsive at first, but still gets stuck in the display loop to the
point of being unusable after a few seconds.

Attachment: test.hpp.gz
Description: application/gzip

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