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Re: What makes set-window-buffer slow?

From: Clément Pit--Claudel
Subject: Re: What makes set-window-buffer slow?
Date: Thu, 23 Jun 2016 17:23:54 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

On 2016-06-23 15:11, Eli Zaretskii wrote:
> Instead of hypothesizing, I suggest to profile your code with
> profiler.el.  If indeed redisplay is taking the time, you should see
> that in the profile.

The profile doesn't show that, unfortunately; in fact, we spent a significant 
amount of time trying to understand what was taking all that time by looking at 
the profile, but nothing in there was taking more than 30% of the time, and 
even optimizing away a function that according to the profile took 28% of the 
time didn't yield a measurable runtime difference.

Commenting out the call to set-window-buffer (or predicating it on the window 
not already displaying the buffer), on the other hand, does yield a 95% 
performance gain.  set-window-buffer does not appear in the profile; 
redisplay_internal does appear, but it only is credited with 30% of the 
execution time.

I wonder what might explain these results...

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