[Rd] Postscript can be very slow in R 2.13-0

[Stephen Milborrow]

Viewing certain postscript files under R 2.13-0 is very slow, at least using
GSview on my 64 bit Windows 7 system.  To see this, compare how long it 
takes to display these two files (fast.ps was created by removing the /srgb 
stuff in .ps.prolog):

    www.milbo.org/postscript/slow.ps

    www.milbo.org/postscript/fast.ps

The code to produce the above two files is here:

    www.milbo.org/postscript/slow-postscript.R

This is not exactly a bug, but is it a known issue?  The hack used to
produce fast.ps above is fragile and not suitable for regular use.  Is there
a option to the postscript() function (or could one be added) that would
sacrifice sRGB support for speed?

Stephen Milborrow
www.milbo.users.sonic.net

Version info:

I'm using GSview 4.9 and Ghostscript 8.64.

> R.version
               _
platform       x86_64-pc-mingw32
arch           x86_64
os             mingw32
system         x86_64, mingw32
status
major          2
minor          13.0
year           2011
month          04
day            13
svn rev        55427
language       R
version.string R version 2.13.0 (2011-04-13)