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Re: Slow fontification in C mode buffers

From: Eli Zaretskii
Subject: Re: Slow fontification in C mode buffers
Date: Sat, 03 Dec 2011 17:14:27 +0200

> From: Sujith <address@hidden>
> Date: Sat, 3 Dec 2011 20:33:15 +0530
> Cc: address@hidden,
>     Alan Mackenzie <address@hidden>
> I can see this behavior on a low-spec machine - Intel Atom @ 1.66 GHz with
> 1GB RAM running GNU/Linux. C mode is really slow with maximum font-lock
> decoration and hitting C-v a few times is enough for the screen to lock up,
> while the CPU chugs away at full usage. After the buffer has been fully 
> fontified,
> scrolling is fast. My current workaround is to set 
> font-lock-maximum-decoration
> to 2.
> I tried the pretests to see if things have changed, but 24.0.92 has pretty 
> much
> the same behavior.


Do you see any significant difference in performance between when
point is inside of a very large comment, like at the beginning of
src/xdisp.c, and when point is in "normal" C code, with only
relatively short comments?

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