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It is not about the interpreter. You just can't express performant code in these languages.

JIT compilation makes Javascript faster, but it is not by any metric "fast".

Depending on specific use-case, today's JavaScript code is only 2–7 times slower than corresponding C++. That's pretty damn fast. Faster than some compiled languages. Fast enough that if you wanted to obsess over performance you can build the fastest backend framework in Node.js[0][1]

[0] https://www.techempower.com/benchmarks/#section=data-r21&tes...

[1] https://just.billywhizz.io/blog/on-javascript-performance-01...

Hmm...2-7x slower is slow, and that's almost certainly after warmup.

Just to put it in perspective: the new Team's startup time is ~9 seconds. At 7x faster, it would be slightly above 1 second, which would be OK.

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