Comment by pjmlp

> If it was just slow because it was interpreted they could easily have added a good JIT or transpiler by now, but it's also extremely dynamic so anything can change at any time, and the type mess doesn't help.

See Smalltalk, Common Lisp, Self.

Their dynamism, image based development, break-edit-compile-redo.

What to change everything in Smalltalk in a single call?

a becomes: b

Now every single instance of a in a Smalltalk image, has been replaced by b.

Just one example, there is hardly anything that one can do in Python that those languages don't do as well.

Smalltalk and Self are the genesis of JIT research that eventually gave birth to Hotspot and V8.