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Re: Regarding performance issues with the Emacs 25.1 Windows-build

From: Eli Zaretskii
Subject: Re: Regarding performance issues with the Emacs 25.1 Windows-build
Date: Wed, 30 Nov 2016 16:48:01 +0200

> From: Fabrice Popineau <address@hidden>
> Date: Wed, 30 Nov 2016 08:56:09 +0100
> Cc: address@hidden, Eli Zaretskii <address@hidden>,
>       Noam Postavsky <address@hidden>,
>       Jostein Kjønigsen <address@hidden>,
>       Emacs developers <address@hidden>
> There is a user on Reddit who pretends that theses latest binaries of Emacs 
> run slower on Windows than on
> Linux.
> I didn't get a chance yet to give it a try.
> The test is as follows :
> - Install Helm from MELPA.
> - Add this config to the init file, as suggested by Helm page
> https://www.reddit.com/r/emacs/comments/5e3xpu/emojis_in_emacs_intentionally_disabled_for_osx/dabya5i/
> If anybody has a chance to do the testing. I'm not sure about what helm 
> config he is
> talking about (the full one or the default one).

Helm fires up a lot of subprocesses, and subprocess handling in Emacs
on MS-Windows is complicated and involves synchronization between
threads.  Maybe that is at least one reason for slower startup.

Another reason could be intensive file I/O, which is more efficient on
GNU/Linux (not related to Emacs).

> My guess is that something else than emacs is disturbing his load time 
> (antivirus ?).

Yes, antivirus could be yet another reason.

But I agree that without a reproducible recipe, this discussion is a
bit academic.

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