bug#30731: Slower startup using March (27.0.50) build in windows

[Noam Postavsky <npostavs@gmail.com>]

Shuguang Sun <shuguang@gmail.com> writes:

> I read the disussions and patches, and I find out the 3.692 sec at
> the beigining seems package initialization (according to the patch in
> Feb 17).
> However, I still don't get
> 1. What is an early init file?

It should be explained in `(emacs) Early Init File' and `(elisp) Init
File'.

> 2. Why custom-set-variable  get slower?

Not sure, we need to see some more detail to find out.  Can you figure
out if it's all variables getting slower, or is there some specific
variable setting that causes the slowdown?

> 3. If i want to disable package initialization prior to any thin in
> the .emacs, but after custom-set-variable and some environment
> variables setting (e.g. PATH, exec-path), how to do it?
>
> Could you help provide an example using my situation?
> 1) I use a Windows 7 box, and have HOME env variables, and .emacs.d
> folder under it
> 2) I have a site-start.el for environment variables setting (e.g.
> PATH, exec-path)  <= I thinks this it not critical because it has no
> speed effect after I delete the site-start.el
> 3) I have .emacs under HOME, and compile it to .emacs.elc to speed it
> up
> 4) I load dired.el and then custom-set-variable, then some frame
> settings , then initialize package using
> (setq package-enable-at-startup nil)
> (package-initialize)

The package-enable-at-startup setting should be moved to
~/.emacs.d/early-init.el.

Possibly also the settings in site-start.el (since the early-init.el
runs before site-start.el, as described in `(elisp) Startup Summary').