CGI.pm, by itself, is around 237K bytes of code - and it pulls in Carp (8 Kbytes in perl 5.8.8). Carp then pulls in Exporter (15 Kbytes), Exporter pulls in Exporter::Heavy (6 Kbytes) and Exporter::Heavy pulls in strict (3 Kbytes). If you do a 'use warnings;' that pulls another 16 Kbytes. If you do 'use CGI::Carp;' that will tack on another 16 Kbytes.

I shouldn't have to say, yet again, that CGI.pm uses a self-loading scheme to avoid compiling everything, so the way you load it makes a tremendous difference.

I will say that in this type of microbenchmark, the contents of @INC and the location of modules in @INC can have a tremendous difference. Perl startup speed can depend greatly on the number of stat calls.

In reply to Re^2: Why can code be so slow? by chromatic
in thread Why can code be so slow? by freakingwildchild

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