I wasn&#x27;t talking about all high level languages, just LISP.  My experience is that people who like a particular language try to rationalize and convince others that there is no downside.<p>I would love to see and example of LISP being as fast as C++ with multi-threading and cache coherency taken into account, using the same amount of memory, with no pauses from the gc that would affect interactivity.  If it hasn&#x27;t happened in the last half century though, I don&#x27;t think it&#x27;s going to happen at all.