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Re: What makes set-window-buffer slow?

From: Eli Zaretskii
Subject: Re: What makes set-window-buffer slow?
Date: Fri, 24 Jun 2016 09:54:53 +0300

> From: Clément Pit--Claudel <address@hidden>
> Cc: address@hidden, address@hidden, address@hidden
> Date: Thu, 23 Jun 2016 17:23:54 -0400
> 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...

Any hope of seeing the profile, fully expanded?

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