"modern JITs" aren't so modern at all. All that work was originally done on Smalltalk in the 1980s — it's also entirely tangential to JITing compilers, as it ca

"modern JITs" aren't so modern at all. All that work was originally done on Smalltalk in the 1980s — it's also entirely tangential to JITing compilers, as it can easily be done with interpreters too, so it's not even a cost of this particular style of dynamic object model — it's a cost of this implementation strategy of this particular style of dynamic object model. The fact that PyPy manages fine shows it is not the language, or any model to which it subscribes, that is at fault.