> Is it something to do with the extreme dynamic nature of the language? Smalltalk/SOM, JavaScript and Lua share the "extreme dynamic nature" but still have mu

> Is it something to do with the extreme dynamic nature of the language? Smalltalk/SOM, JavaScript and Lua share the "extreme dynamic nature" but still have much faster JIT implementations. From my reports you can see that V8 (Node) is about ten times and LuaJIT about five times faster than MRI Ruby 3 JIT. Here are some other performance results using the same benchmark suite: https://github.com/smarr/are-we-fast-yet/blob/master/docs/performance.md https://github.com/smarr/are-we-fast-yet/blob/master/docs/pe.... Also TruffleRuby is reported to perform much better than MRI Ruby JIT (see e.g. https://pragtob.wordpress.com/2020/08/24/the-great-rubykon-benchmark-2020-cruby-vs-jruby-vs-truffleruby/ https://pragtob.wordpress.com/2020/08/24/the-great-rubykon-b...).