It's the other way round: Perl 5 evolution was slow until maybe three years ago, since then it has picked up speed rapidly. 5.12.0 came out five months after 5.

It's the other way round: Perl 5 evolution was slow until maybe three years ago, since then it has picked up speed rapidly. 5.12.0 came out five months after 5.10.1. Since then, there are monthly development releases, and 5.13 is already shaping up nicely.