Because the current Perl5 VM is a complex evolved mess that is very hard to maintain and optimise. All the bits of
Parrot implemented so far have been faster than the Perl5 equivalents.
But that doesn't mean that if everything is implemented,
everything is still faster than the Perl5 equivalents.
Perl5 has seen a slowdown over time as well. Which can
be largely contributed by the fact the language has become
more complex, and perl needs to do more.
Now, it may turn out that in the end Parrot is faster than
Perl5 (which is to be expected, if only if it's a complete
rewrite), but the comparison of bits of the final Parrot
vs the complete Perl5 isn't fair IMO. Let's compare when
Perl6 and Parrot are done, and then again 6 years later,
when Perl6 and Parrot have to deal with half a dozen years
of bolting on new features.
Abigail
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