js-framework-benchmark is the standard benchmark for UI-heavy, compute-light JS. https://krausest.github.io/js-framework-benchmark/current.ht...

To see results, show "vanillajs-1" and "wasm-bindgen", then hide everything else. WASM is about 6% slower, 18% longer startup, and 66% more memory usage.

Note this is a UI benchmark so the results are overwhelmingly dominated by DOM interop. Things should improve if the WASM interface types proposal ever lands.