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Re: Display slowness that is painful

From: Kim F. Storm
Subject: Re: Display slowness that is painful
Date: Tue, 07 Feb 2006 10:14:39 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

"Richard M. Stallman" <address@hidden> writes:

>     Well, it generates the desired_matrix for all windows/frames
>     before it decides what parts of the display should be updated
>     by comparing to the current_matrix.  
>     If generating the desired_matrix takes a long time, emacs
>     doesn't update the display for a long time...
> It seems surprising that generating the desired_matrix would take
> a whole second on a modern computer. 

Redisplay time is [at least] O(n) when n is the length of
the longest line in the current window.  So just use a sufficiently
long line to make redisplay take more than 1 second.

In the case you raised, redisplay takes 4 seconds on my 1.4 GHz laptop.

> Is that often the case
> in your usage?

Huh? No.

YOU said YOU have this problem and wanted us to work on a fix.  
Now you say it is not an issue anymore.  So I'm confused!

Kim F. Storm <address@hidden> http://www.cua.dk

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