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Quake 1 (about 100k lines of C) runs in the browser just fine: https://www.netquake.io/quake

Yes, it's a 30 year old game but the typical CRUD web app doesn't have close to the complexity of quake. Good C++ code is significantly faster than JS, that's true, but JS is also much, much faster than you'd think.

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That quake demo is surely running on the WASM runtime which isn't really related to JavaScript: https://en.m.wikipedia.org/wiki/WebAssembly

Webassembly started its life as a JS hack, called asm.js: https://en.wikipedia.org/wiki/Asm.js, which itself was fully capable of running Quake.

Here's the Unreal engine demo from 10 years ago: https://www.youtube.com/watch?v=XsyogXtyU9o

now you can make web apps in your compiled language of choice (limited choice) and not worry (as much) that its not fast enough

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