zimoun <zimon.toutoune@gmail.com> writes:

> Hi,
>
> On Tue, 17 May 2022 at 14:00, Akib Azmain Turja <akib@disroot.org> wrote:
>
>> I used to have more than hundred Emacs packages managed by Guix.  But
>> the startup time was more than 5 seconds.  Then to switched package.el,
>> and the startup time decreased to less than 1.5 seconds.  I'm not sure
>> why this happened, but I think the cause is maybe too many "redisplay"s
>> due to many loading messages during startup.
>
> Well, I do not know.  Hum, I do not have more than hundred,
>
> --8<---------------cut here---------------start------------->8---
> $ guix package -p ~/.config/guix/profiles/emacs/emacs -I | grep emacs | wc -l
> 43
> --8<---------------cut here---------------end--------------->8---
>
> but it does not takes so long:
>
> --8<---------------cut here---------------start------------->8---
> $ time emacs -f kill-emacs
>
> real    0m1.682s
> user    0m1.279s
> sys     0m0.241s
> --8<---------------cut here---------------end--------------->8---
>
> which looks similar to,
>
>         M-x emacs-init-time
>         1.727791789 seconds
>
> therefore, I am surprised by your timings.  For instance,
>
> --8<---------------cut here---------------start------------->8---
> $ guix shell emacs $(guix package -A | grep ^emacs- | cut -f1 | head -200)
> [env]$ time emacs -nw -q -f kill-emacs
>
> real    0m2.368s
> user    0m2.037s
> sys     0m0.309s
> --8<---------------cut here---------------end--------------->8---

The timing maybe wrong, because it is more a year old (and I didn't
measure).  I was new to Emacs Lisp (I used Doom before), and my init.el
was messy.  So maybe the init file had something in it that was
responsible for slow startup when the packages managed by Guix.

>
>
> Well, I do not know if ’with-eval-after-load’ is enough for somehow
> allowing lazy loading.  Hum, I am not convinced that the ’redisplay’ is
> the issue but instead, yeah maybe walking all the files requires some
> filesystem IO and yeah maybe one unique big concatenated autoload file
> would improve the situation.

Loading many autoloads files isn't a big deal for me, I don't use that
optimization.  With `package-quickstart' set to t, my init time is only
0.1 seconds faster, which I don't care.

>
>
> Do you use ’use-package’ or something similar for your config?

Yeah, I use `leaf'.

>
>
> Cheers,
> simon

-- 
Akib Azmain Turja

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