Re: cc-mode fontification feels random

[Eli Zaretskii]

> From: Óscar Fuentes <ofv@wanadoo.es>
> Date: Thu, 10 Jun 2021 19:40:56 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Daniel Colascione <dancol@dancol.org>
> >> Date: Thu, 10 Jun 2021 10:07:52 -0700
> >> Cc: rudalics@gmx.at, monnier@iro.umontreal.ca, rms@gnu.org, 
> >> emacs-devel@gnu.org
> >> 
> >> > Then I suggest to set it to 2 by default.
> >> 
> >> Performance is reasonable most of the time.
> >
> > Not IME.
> 
> But your use case is not representative, isn't it? Using a debug build
> with checks enabled have a large impact on performance.

See my other message: you have an inaccurate impression about my use
cases.

And I don't really agree that debug builds are uninteresting: if they
are so slow, it means our fontification is borderline even on
relatively fast machines.

> BTW, from time to time I use a 2011 netbook with an Atom CPU and have no
> complaints while working with 30k lines-long machine-generated (read:
> code-dense, comment-sparse, almost no withespace) C++ files.

Exactly.  So why cannot we have the same level of performance, and
need to rely on compiler optimizations even on a fast i7?