I think the other issue if we compare it to JS is the unfortunate reliance on C that python has. When Chrome came around, JavaScript was already standardised an

I think the other issue if we compare it to JS is the unfortunate reliance on C that python has. When Chrome came around, JavaScript was already standardised and there were many competing implementations which had to conform to ECMAScript and give users a relatively consistent experience. So when Google made V8 they could kind of go crazy with optimisations as long as they conformed to the spec. Python on the other hand has one real implementation, and the ecosystem has become extremely intertwined with that implementation. Implementing a new Python interpreter is great, but it rarely gains traction because most of the ecosystem is so reliant on CPython specific modules that don’t work in the new interpreter so they never really get off the ground.