One common complaint of Clojure REPLs is their [startup time](http://puredanger.github.io/tech.puredanger.com/2013/12/01/clj-problems/). Although that complaint is often somewhat unfounded (and related to tooling), it still takes the bare Clojure JAR about 1 second to start on new hardware. [Planck](http://planck-repl.org) — through bootstrapped ClojureScript, and owing to the small latency exhibited by JavaScript VMs — managed to improve the time that it takes to bootstrap a Clojure(Scri...
