I haven't read it, but this article might address your performance question: https://www.mikeash.com/pyblog/friday-qa-2017-06-30-dissecting-objc_msgsend-on-arm6

I haven't read it, but this article might address your performance question: https://www.mikeash.com/pyblog/friday-qa-2017-06-30-dissecting-objc_msgsend-on-arm64.html https://www.mikeash.com/pyblog/friday-qa-2017-06-30-dissecti...