How about: watch your language, or get off HN? No, he doesn't have to measure. He wrote a post in his own blog. You are neither forced to read it, nor to take

How about: watch your language, or get off HN? No, he doesn't have to measure. He wrote a post in his own blog. You are neither forced to read it, nor to take action on what it says. If you are interested in the actual profiling to see the performance penalty, you can do it yourself. It is enough for him to start the discussion on the matter, which is far more than you did.