Some of the mentioned performance and language changes were being outlined at the corehackers wiki
Using XS for performance is silly, because the XS API is silly. One should not copy values to/from perl arrays for c stack arguments, perl should use the C stack as perl4 did for its argument passing. Larry just did not know the libffi or ffcall libraries then.
The pp_ API with the same perl stack API is also pretty unoptimizable, but this can be rewritten.
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