Emacs build times on Windows

[Christoph Scholtes]

Hi,

My personal Jenkins build server tells me that building Emacs on Windows 
from a clean trunk via `make bootstrap', `make info', `make install-bin' 
takes around 50 minutes on a fairly recent Centrino Dual Core Laptop.

Granted that we are doing (unnecessary) rebuilds of code with PURESIZE 
(which I am trying to eliminate) it is still ridiculously slow.

Especially the byte compilation is crawling compared to a GNU/Linux 
machine. At work I have a decent quad core desktop with GNU/Linux and I 
can kick off a bootstrap with -j4 and it is done before I come back from 
getting my coffee. Especially byte compilation stage seems to be a lot 
faster on GNU/Linux than it is on Windows.

Any ideas why?

Christoph