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bug#18522: 24.4.50; mapcar is very slow

From: Peter Münster
Subject: bug#18522: 24.4.50; mapcar is very slow
Date: Wed, 24 Feb 2016 11:25:10 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

On Tue, Feb 23 2016, Eli Zaretskii wrote:

> We need to time that loop to be sure.  Can you do that with 'perf', 

How please?

> or add a call to gettimeofday before and after, and see how much time
> it takes as the list of buffers grows?

Then, I would need to restart emacs. If it's possible to measure the
time without restarting it, that would be better.


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