Re: Is Emacs buffer scroll/redisplay slow?

[Fabrice Popineau <fabrice.popineau@gmail.com>]

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Le dim. 19 janv. 2020 à 16:28, Eli Zaretskii <eliz@gnu.org> a écrit :

> > From: Fabrice Popineau <fabrice.popineau@gmail.com>
> > Date: Sun, 19 Jan 2020 15:24:19 +0100
> > Cc: Emacs developers <emacs-devel@gnu.org>
> >
> >  > .... scrolling through an elisp buffer: I started the timer by hand
> and
> >  > scrolled down for 1000 lines ....
> >
> >  How, exactly, did you do the scrolling?  How did you stop the scrolling
> >  at 1000 lines?  Do you get this slowness on any elisp buffer, or is it a
> >  particular one?
> >
> > I used my phone timer. It was my init.el file but I get the same result
> with dired.el
>
> You didn't answer the question about the exact way of scrolling you
> used.


C-n or down arrow


> Also, did you measure the CPU time it took, out of those 35 sec?  (I
> assume the time you measured was elapsed time, yes?)
>
> >  > .... and it took 45s on Windows/WSL and 35s on Windows/native.
> >
> >  That is slow indeed.
> >
> > Definitely.
>
> Not necessarily.  The elapsed time has little to do with the speed we
> scroll.


We could expect emacs to be a little bit more reactive here.

Fabrice

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