bug#58634: Long delay with blank screen whilst loading desktop at emacs startup

[Alan Mackenzie]

Hello, Emacs.

In my current desktop file, I have 166 buffers.  I'm using an up to date
Emacs 29.

On loading this desktop into emacs -nw on X Windows, or into a linux
console, it takes a long time to load, around 28 seconds.  Of that time,
my terminal window/screen is entirely blank for around 18 seconds, with
not even a mode line being displayed.

Doing the same in a GUI run on X also takes around 28 seconds to load,
but during that time, random buffers are displayed on the screen,
complete with mode line.

I think the native compiler is running in the background during this 28
seconds, and thus contributes to the relatively long start up time.

This ~18 seconds of blank screen is likely to be disconcerting to some
users, and thus surely should be reckoned as a bug.

My current configuration of Emacs 29 has --with-native-compilation set,
otherwise, nothing relevant

-- 
Alan Mackenzie (Nuremberg, Germany).