Slow compile on Windows XP - font caching problem?

[Trevor Daniels]

A week ago I upgraded from 2.11.34 to 2.11.41, and noticed
the compile time seemed longer than previously.  I've just
done a few tests with a trivial file.  Using 2.11.34 the
compile time to pdf production takes around 15 secs, but
with both 2.11.41 and 2.11.42 the same file takes 55-60
secs - four times longer.  This is running on Windows XP
SP2.

Investigating further, I see that the font cache was changed
between 2.11.34 and 2.11.41.

Under 2.11.34 the fonts are cached in C:\Documents and
Settings\[username]\.fontconfig.  This contains three files,
2 small and one large (518 KB).  When LilyPond compiles it
changes the two small files but not the large one.

Under 2.11.42 the fonts are cached in C:\Documents and
Settings\[username]\.lilypond-fonts.cache-2.  This also
contains 2 small and one large (682 KB) files, but when
LilyPond compiles it changes just the large file - every
time.  This is pretty certainly where the extra time is
going, as the time stamp on this file updates around 45 secs
after starting the compile.

This may well be the same as the Vista slowness problem
which was also related to font caching.

Trevor D