Node vs Lua shows Node faster than Lua. https://benchmarksgame-team.pages.debian.net/benchmarksgame/...
Node vs C, only 4 to 5 times slower. https://benchmarksgame-team.pages.debian.net/benchmarksgame/...
Looking at its root, it is not too bad as a JIT compiled language.
https://benchmarksgame-team.pages.debian.net/benchmarksgame/...
You can write terrible non-performant code in assembly and C, and perfectly speedy pages in html and javascript (say the page you're on at the moment).
You wouldn't write a new cutting edge video codec in javascript - not one you wanted to use anyway - but given that we had performant guis running on 286s at 12MHz, Javascript being 1/10th the speed of C isn't the problem.
All you need to know about the level of knowledge of average JS hater/muh native performance.