Poorly, see <a href="https:&#x2F;&#x2F;github.com&#x2F;s-macke&#x2F;jor1k&#x2F;wiki&#x2F;Benchmark-with-other-emulators" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;s-macke&#x2F;jor1k&#x2F;wiki&#x2F;Benchmark-with-other-e...</a><p>Primarily due to the use of asm.js. I intend to implement a JIT similar to QEMU&#x27;s tcg as soon as Web Assembly supports it: <a href="https:&#x2F;&#x2F;github.com&#x2F;WebAssembly&#x2F;design&#x2F;blob&#x2F;master&#x2F;FutureFeatures.md#platform-independent-just-in-time-jit-compilation" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;WebAssembly&#x2F;design&#x2F;blob&#x2F;master&#x2F;FutureFeat...</a>