I think my emphasis was still fair, even though it is probably a misquote. There are usually many bottlenecks in any given system, be it lack of proper paralle

I think my emphasis was still fair, even though it is probably a misquote. There are usually many bottlenecks in any given system, be it lack of proper parallelization, waiting on xyz while you could use that opportunity to do other tasks and so on that language tend to account for small part of these. Sure, if you are hitting the limit of that kind of optimizations, language could be the next thing you want to use to optimize further, but usually systems are far from that.