There is a big difference between JIT compiled _dynamic_ language and ahead of time compiled static language. While modern JS engines show that difference sometimes can be narrowed down with sophisticated JIT and runtime, it is still there.
replyRuby's YJIT compiler does compile ahead of time, the details are in the link provided. On the first run it will, if feasible, compile blocks of frequently executed code and stow it away for when it's needed next. So only on the first run is it interpreting everything.
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