No, the Hermes interpreter is probably on-par with the JSC-Interpreter if this is a comparison made on iOS React Native apps. JSC-JIT is usually on par or ahead

No, the Hermes interpreter is probably on-par with the JSC-Interpreter if this is a comparison made on iOS React Native apps. JSC-JIT is usually on par or ahead of V8, the iOS JIT restrictions really fudges up results since it's so imperative for JS performance. From what I've seen Kotlin(and Swift prob also) semantics are fare more AOT-compile friendly so they're probably a fair bit ahead (depending on how much you gimp your JS target to mimic Asm.JS/Wasm but most regular JS developers won't write code that way).