Those are microbenchmarks, and as such are misleading when it comes to evaluating JIT-ed languages. They also don’t involve ever touching the DOM, which is a major source of slowdowns in real-world JS apps.
That actually makes me want to create a set of UI benchmarks comparing performance standard UI operations in C++ with Qt vs JS with DOM. I think I’ll look into it over the weekend.
And C++ compiled to WASM will have the same slowdowns if it needs to touch the DOM.