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Re: Slow fontification in C mode buffers

From: Kan-Ru Chen
Subject: Re: Slow fontification in C mode buffers
Date: Wed, 14 Dec 2011 23:02:12 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux)


Alan Mackenzie <address@hidden> writes:

> Hello, yet again!
> On Tue, Dec 13, 2011 at 11:31:36PM +0800, Kan-Ru Chen wrote:
>> Alan Mackenzie <address@hidden> writes:
>> > By a happy coincidence, I've just tracked down another sluggishness (in
>> > large array initialisations, reported by Peter Milliken on bug-cc-mode)
>> > which looks to have exactly the same cause, namely
>> > `c-font-lock-enclosing-decls' which fontifies the innards of a
>> > struct/union/enum when jit-lock etc. starts in the middle of it.
>> Is this the same problem?
>> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10288

I was editing this file


The one in bug report is a reduced example that has same behavior

> As a workaround, put this into your .emacs:
> (add-hook 'c-mode-common-hook
>           (lambda () (setq c-macro-with-semi-re nil)))
> .  It gives a speed up of about a factor of 4.

Thanks! "Macros with ;" is a very useful tip too.

> As a more drastic workaround, disable font-locking with
>     M-x font-lock-mode

The fix for Peter also helps a bit.


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