Because Raku has a better internal representation for integers than Perl's SvIV and can manage ranges lazily without reifying a large data structure. (I can't remember right now if Perl optimizes this in recent releases.)
I don't know what doing nothing a billion times in 12 or seconds has to do with my point that the semantic mismatch between a language and a target platform is difficult to manage, however.
You can port Raku to LLVM or Node or Inferno or whatever platform you want, but unless that platform can optimize grammars that require dynamic dispatch for every individual lexeme, you're going to end up with a slow Raku.
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