To get better DX, I added some development-time helpers to malli. Sadly, this has a big cost on starting the REPL: I takes now 7secs with my new Macbook to load all the stuff just for this one lib. With manual pre-compilation described in https://clojure.org/guides/dev_startup_time, it takes less than 500ms, which is ok. Could the client-side precompilation of dependencies be a default feature in Clojure? or clj tooling? I recall hearing that this was under investigation at some point.