All of chromatic's responses apply, but the comparisons above are flawed at even a more basic level.
To really have a fair comparison, one needs to compare the memory footprint and startup time of Rakudo versus Perl 5 *with* all of Moose, Devel::Declare, Regexp::Grammars, Contextual::Return, Data::Dumper, etc. loaded and available. Otherwise you're not really comparing equivalent capabilities.
I suspect Rakudo may still come out slower and fatter than an "equivalent Perl 5", but likely much less so than these naive comparisons seem to suggest. And we're still very early in the "optimization" aspects of the development process for Rakudo.