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bug#8890: 23.3; message writing slows emacs

From: Dave Abrahams
Subject: bug#8890: 23.3; message writing slows emacs
Date: Thu, 15 Sep 2011 22:22:45 -0400
User-agent: Gnus/5.110018 (No Gnus v0.18) Emacs/23.3 (darwin)

on Sun Sep 11 2011, Dave Abrahams <dave-AT-boostpro.com> wrote:

> on Sun Sep 11 2011, Eli Zaretskii <eliz-AT-gnu.org> wrote:
>>> From: Lars Magne Ingebrigtsen <address@hidden>
>>> Cc: Eli Zaretskii <address@hidden>,  address@hidden
>>> Date: Sun, 11 Sep 2011 16:52:56 +0200
>>> Emacs does clever screen updates, though.  So if the only thing that
>>> changes is the number before the percentage, Emacs won't repaint the
>>> entire line, I think?
>> True.  Like I said, redisplay of the echo area is very fast.
> I don't think it's clever enough.  Try this:
> (let (timings)
>   (dolist (reps '(1 10))
>     (let ((start-time (current-time)))
>       (loop for x to 10000 do
>             (loop repeat reps do
>                   (message "message #%s" x)))
>       (push (time-subtract (current-time) start-time) timings)))
>   (message "%s" (mapcar 'time-to-seconds timings)))
> I get (29.539774 2.514761)
> I think this shows that it takes (more than) 10x as long to write out
> the same message 10 times as it does to write it out once.


The above looks to me like conclusive evidence that writing out the same
percentage many times as part of a progress indication, rather than,
say, updating progress information once per second, will slow things
down a lot... and that's not a Gnus-specific problem.  *I* think this is
important, anyway.

Dave Abrahams
BoostPro Computing

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