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The essential code-paths within the Perl compiler/interpreter itself are already well-identified and are optimized.

That may be true (it isn't, but it's at least plausible) if you take into account the current design of the Perl 5 VM. Unfortunately, the current design of the Perl 5 VM makes some assumptions which preclude performance.

It's enlightening to run some of the silly microbenchmarks people use for competitive benchmarking to see exactly why Perl 5 scales so badly on some of them. (See also my response on compact, typed arrays.)

Certainly, there are bona-fide edge cases, throughout the Perl system and its libraries, that are properly handled right now with XS code, in C or C++.

Cases also exist where writing XS will make your code slower—and I don't mean writing inefficient XS.

In reply to Re^2: Perl 5 Optimizing Compiler by chromatic
in thread Perl 5 Optimizing Compiler by Will_the_Chill

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