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Re: Low redisplay performance (23 regression)

From: Chong Yidong
Subject: Re: Low redisplay performance (23 regression)
Date: Wed, 29 Apr 2009 14:45:41 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.91 (gnu/linux)

David Reitter <address@hidden> writes:

> On Apr 29, 2009, at 1:40 PM, Tassilo Horn wrote:
>> And on yet another related note, today I've found out that after
>> changing the font scale for the current buffer using `C-x C-+' or `C-x
>> C--' line-by-line scrolling slows down considerably.
> As said earlier, I found that using face-remapping is highly
> correlated with this slow-down.

I think the problem is that lookup_basic_face computes the remapped
face_id in an expensive way.  It needs to do some caching.

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