I dunno, it&#x27;s very easy for me to express things differently in C++ and get a different runtime. It&#x27;s easy enough for a bunch of C++ programmers writing needlessly slow code whom I&#x27;ve known. It must be equally easy for the author. The reason he doesn&#x27;t ought to be vast experience with C++, so that he doesn&#x27;t try obviously dumb things (as in things that malloc a ton of stuff needlessly, etc.), whereas his Rust experience is necessarily smaller. I think you need quite a bit of experience to declare that, well, experience just doesn&#x27;t help because the performance model of this thing is weird!