V8 has a JIT-free mode now, and it's still pretty damn fast in real world situations. It looks like in synthetic benchmarks they saw up to 80% decrease in perfo

V8 has a JIT-free mode now, and it's still pretty damn fast in real world situations. It looks like in synthetic benchmarks they saw up to 80% decrease in performance, but in real-world applications they saw as little as a 6% decrease. https://v8.dev/blog/jitless https://v8.dev/blog/jitless But even an interpreted language can still be vulnerable to Spectre attacks.