That's not accurate. I Googled for a recent performance benchmark and found this which indicates Wasm offers a notable performance gain: https://medium.com/@hashbyt/webassembly-vs-javascript-perfor...

it is faster, but there is unacceptable loss when passing data to/from js, definitely an area needing improvement (or having to do it less)

https://hacks.mozilla.org/2026/02/making-webassembly-a-first...