GNU bug report logs - #18752
24.3.94; Why is Cygwin Emacs 2x quicker than Windows Emacs?

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Message #17 received at 18752 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Fabrice Niessen <fni-news <at> pirilampo.org>
Cc: 18752 <at> debbugs.gnu.org, cygwin <at> cygwin.com, dmoncayo <at> gmail.com
Subject: Re: bug#18752: 24.3.94;
 Why is Cygwin Emacs 2x quicker than Windows Emacs?
Date: Sat, 18 Oct 2014 08:42:48 +0300

> From: Fabrice Niessen <fni-news <at> pirilampo.org>
> Cc: 18752 <at> debbugs.gnu.org,  cygwin <cygwin <at> cygwin.com>, dmoncayo <at> gmail.com
> Date: Fri, 17 Oct 2014 23:08:51 +0200
> 
> > You also forgot to tell what compiler options were used for each
> > build.  E.g., if the Cygwin build is optimized, whereas the MinGW
> > build is not, the twofold speedup is expected (I generally see
> > a factor of 2.5 between an optimized and unoptimized build).
> 
> I have no idea how Cygwin Emacs gets compiled, nor Windows Emacs (done
> by Dani). Putting them in Cc.

As Ken points out, the variable system-configuration-options is the
way to tell.

Given that the Cygwin build is optimized, it suffices to show that the
MinGW one isn't, to explain the difference in speed.

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