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Update: We’ve looked JSON serialization specifically where axum was pretty far down in the rankings. It seems other frameworks are doing weird hacks to improve response times. For example look at this code for actix-web. No one writes code like that and when you compare more real code in actix-web and axum, axum wins by about 6%.
That's partially true. just does have a sizeable portion (5k SLoC) of it's codebase in C++, however alot of the performance is from tuning behavior to play nicely with V8. Here's a blogpost from the author on the subject.
Just-js http module is pretty much entirely written in C++. Whole Just is pretty much C++ code.