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bug#22884: 25.0.92; C/l mode editing takes waaaayy too long

From: Paul Eggert
Subject: bug#22884: 25.0.92; C/l mode editing takes waaaayy too long
Date: Fri, 13 May 2016 14:09:27 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0

On 05/13/2016 01:37 PM, Glenn Morris wrote:
What about other C code, besides the Emacs sources?
What if anyone ever wants to edit an older version of the Emacs sources?

Older versions of Emacs have smaller config.h files, which makes the problem significantly smaller. I just now visited a config.h file for Emacs 23.4, and the same “type ‘/ /’” benchmark took about two seconds on my six-year-old desktop (Fedora 23 x86-64, AMD Phenom II X4 910e). Although two seconds is pretty annoying, it's considerably better than the ten seconds I was seeing with emacs-25 before we worked around the problem there.

Although Non-Emacs sources may have the problem, I imagine it's reasonably rare.

Your initial report said: "This sort of thing makes Emacs effectively
unusable for editing [some C code]", which is, y'know, a pretty bad state.

Yes, it is indeed a bad state. However, the problematic situations are rare and cause slowdowns rather than crashes, so the case for making it a blocker is not as strong as it could be.

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