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In all of those benchmarks ruby runs with —jit

And … ?

...and will have worse results because of jit not having enough time to kick in.

You seem to be claiming that —

35 minutes cpu for a 200 line Ruby fannkuch-redux program

— is "jit not having enough time to kick in"?

fwiw in this case, without jit took slightly longer: 36.5 minutes cpu