Pursuing the suggestion to use Devel::Size, I find a memory-profile that ends like this (sorted in ascending order):

   112475 :: Mojolicious::
   178335 :: HTML::
   186117 :: Data::
   241205 :: B::
   246604 :: DBD::
   248277 :: MojoX::
   253124 :: File::
   323990 :: DBI::
   410491 :: Template::
   491445 :: MooseX::
   505433 :: DB::
   626215 :: DateTime::
   645231 :: Mojo::
   847504 :: DBIx::
  1072300 :: Moose::
  1557717 :: SPE::
  2066977 :: Class::
  7846344 :: main::
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Now, I surmise that main:: is the all-encompassing name-space, and of course SPE is the application name-space. I also know that B represents Perl itself. Everything else is, well, “what’s left.”

I pared-down the application namespace (by nearly 3 megabytes...) by eliminating Schema objects that I didn't strictly need. The application already does things like using require to demand-load a page only when it's the page that has been requested.

Does anyone have any ideas what I can do to squeeze this thing down just a little bit more?

Well-l-l... the hosting-company's ever-helpful “technical support” (sic) team offered the helpful suggestion that I could get more room by switching from PHP-4 to PHP-5...   :-D ...