From the perlrun manpage:
-u
causes Perl to dump core after compiling your script. You can then in theory take this core dump and turn it into an executable
file by using the undump program (not supplied). This speeds startup at the expense of some disk space (which you can
minimize by stripping the executable). (Still, a ``hello world'' executable comes out to about 200K on my machine.) If you want to
execute a portion of your script before dumping, use the dump() operator instead. Note: availability of undump is platform
specific and may not be available for a specific port of Perl. It has been superseded by the new perl-to-C compiler, which is
more portable, even though it's still only considered beta.
This is probably useles on windows, but: where can I get this "undump" program? I can't find it on my debian machine..
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