Fast Clojure Startup with CRaC

Clojure is the best programming language, but one of its downsides can be startup time. There are a variety of existing techniques you can use to speed things up but even with those tools, initialization isn’t free. While trying to speed up a CI pipeline, I discovered that Clojure works quite well with CRaC/CRIU on Linux. The idea is that you can start a Clojure REPL, initialize the slow parts of your application, and then checkpoint it.