GNU bug report logs - #64847
Emacs 29 RC1 takes around 25ms longer to start without config and about 25ms with config

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Yanchi Tóth <yanchi.toth <at> gmail.com>
Cc: 64847 <at> debbugs.gnu.org
Subject: bug#64847: Emacs 29 RC1 takes around 25ms longer to start without config and about 25ms with config
Date: Tue, 25 Jul 2023 17:01:48 +0300

> From: Yanchi Tóth <yanchi.toth <at> gmail.com>
> Date: Tue, 25 Jul 2023 15:23:37 +0200
> Cc: 64847 <at> debbugs.gnu.org
> 
> Here's the configuration data for 28.2. I believe it says it was built with --with-native-compilation, but
> not AOT. Is that where you expect the time difference to come from?

Could be, mainly in the "w/ config" case, where presumably Emacs loads
packages that are not preloaded.

In addition, Emacs 29.1 loads 8 more preloaded packages than Emacs
28.2 does, even without config, and those 8 additional *.eln files
need to be loaded at startup (they are DLLs in disguise), which takes
time, especially if your system has some antivirus software active
which checks every DLL loaded by a program.

So I don't think 25 msec of additional startup time sounds outlandish
to me.

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