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> I'm almost sure the python developers said that they will compensate the slow down with other optimizations

Those optimisations are not there to compensate anything; they will improve performance of single-threaded code with or without GIL.

That I meant to express yes. That those non-GIL-related optimizations would soften the blow of any slowdown from the GIL removal project.

Maybe, but making GIL optional (rather than removing it completely) solves both problems.

I however creates another, arguably bigger problem, it fragments the ecosystem.