This article is from the Miscellaneous Macintosh FAQ, by Elliotte Rusty Harold email@example.com with numerous contributions by others.
Versions 7.0 and later of the LaserWriter driver automatically
include all the fonts you use in your document plus the LaserPrep
information plus the TrueType engine (if you're using any TrueType
fonts) in the PostScript file. Thus a 3K document formatted in 90K
of fonts can easily produce a 300K PostScript file. If these fonts
are present on the system you'll be printing from, they don't need
to be included in the document. You can remove them with the
shareware control panel Trimmer or the free UNIX utility StripFonts.
If you're using the LaserWriter 8 driver, you can manually select
an option to leave out all fonts or just the standard thirteen
faces of Times, Courier, Helvetica, and Symbol though for more
control you'll still need StripFonts or Trimmer. See