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Re: Low redisplay performance (23 regression)

From: Tassilo Horn
Subject: Re: Low redisplay performance (23 regression)
Date: Wed, 29 Apr 2009 20:21:34 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.92 (gnu/linux)

David Reitter <address@hidden> writes:

Hi David,

>> 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.

Ah, sorry, I must have missed that.

>> Oh, yet another observation: While writing this mail I enlarged the
>> text scale with `C-x C-+' and if I press and hold the up or down key,
>> point hangs for very short periods of time at some positions and then
>> jumps over some lines without visible redisplay, even though no
>> scrolling at all is done.
> I see the same thing.  Did you (setq redisplay-dont-pause t) ?

No, but setting it doesn't make a big difference here.

> Either way, it suggests that drawing takes much longer with a change
> of faces. (E.g., M-x list-faces-display ?)

Ouch!  Without remapping it scrolls with some minor hangs (tenth of a
second), but with face-remapping it starts fine, but then slows down
very quickly.  From the middle of the buffer to the last line (with
pressing and holding down, ~200 lines) it's basically a 5-10 seconds
hang followed by a jump to the last line -- nothing in between.
redisplay-dont-pause doesn't make a (noticeable) difference for me.


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