With horrible overhead, and in the case of WASM, lots of serialization and API glueing (DOM is just somewhere near the tip of the iceberg) woes, maybe? Would

With horrible overhead, and in the case of WASM, lots of serialization and API glueing (DOM is just somewhere near the tip of the iceberg) woes, maybe? Would be a fun thing to do for sure, but never as fast as the APIs built into the browser runtime.