> Because WebAssembly modules lack direct access to the DOM, they rely on an additional JavaScript interoperability layer, which can introduce extra overhead.

Blazor is slow for other reasons. You can make wasm web frameworks fast (see leptos and dioxus). It can be as fast as vanilla js. Sledgehammer on this benchmark is wasm: https://krausest.github.io/js-framework-benchmark/2023/table...