I didn't realize we were exclusively talking about real-time systems? Do you think people you argue with on HN are so dumb that they would go around claiming high-level GC languages are suitable for real-time systems?

I feel like if your concern is real-time systems, you should probably say you don’t think it’s suitable for real-time systems, instead of talking about performance differences that no one really disagrees but which don’t matter in practice for most applications anyways.

Asking about the actual requirement sounds very much like what you do in real-time systems, vs just being happy with "faster"?