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Re: C mode too slow
From: |
Alan Mackenzie |
Subject: |
Re: C mode too slow |
Date: |
Sun, 12 Jun 2011 20:38:11 +0000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Hi, Stefan
>> _and_ because editing lisp.h is virtually impossible these days. I
>> have to use an old Emacs - almost each editing step takes about 15
>> secs here with the more recent Emacs versions :-(
> I tend to find editing code such as lisp.h too slow as well. Can we
> do something about it?
lisp.h is slow in "brace desserts", since CC Mode uses braces as anchor
points, particularly whilst font locking. This should have been fixed
by the optimisation of c-parse-state.
However, comparing the trunk with Emacs 23.3 the number of calls to
c-parse-state has increased by a factor of ~9, cancelling out the
optimisation. :-( I'm looking to see why this has happened.
I'm actually looking at a large file (without a single brace) called
AT91SAM9263_INC.h, the one which triggered this optimisation. What
seems to me slow in lisp.h is scrolling over areas which haven't yet
been fontified since loading. Once that is done, I think things move at
a decent speed. Is there anything particular, other than initial
scrolling, which is very slow in lisp.h?
--
Alan Mackenzie (Nuremberg, Germany).
- Re: C mode too slow,
Alan Mackenzie <=