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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Two strange messages while building Emacs on MS-Windows
Date: Sun, 09 Dec 2012 05:44:54 +0200
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Cc: emacs-devel@gnu.org, dmoncayo@gmail.com
To: Stefan Monnier <monnier@iro.umontreal.ca>
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Eli Zaretskii <eliz@gnu.org>,  emacs-devel@gnu.org
> Date: Sat, 08 Dec 2012 18:06:14 -0500
> 
> IIRC the Windows bootstrap code is not as well tuned, and byte-compiles
> all the .el files with the "bootstrap-emacs" instead of only compiling
> the preloaded files this way.  That might explain it (the
> "bootstrap-emacs" is an emacs binary built with the non-compiled Elisp
> files, so its Elisp functions are slower).

The more important reason is that byte compilation on Windows during
bootstrap is done sequentially, whereas on Unix it's done in parallel
(under "make -j").