It's because when we running some Clojure app, it loads a huge amount of classes and creates a tons of their instances. There's a good, but a bit outdated, arti

It's because when we running some Clojure app, it loads a huge amount of classes and creates a tons of their instances. There's a good, but a bit outdated, article about that - http://martinsprogrammingblog.blogspot.de/2012/02/why-is-clojure-so-slow.html http://martinsprogrammingblog.blogspot.de/2012/02/why-is-clo... And compiled ClojureScript code is just a bunch of js.