https://github.com/cryogen-project/cryogen/pull/220 updated to be opt-in, adding lein serve[-fast] and clojure -X:serve-fast for running with the fast compilation turned on. Next, docs.
https://github.com/cryogen-project/cryogen-docs/pull/40 updated to mention the serve-fast commands.
Also opened https://github.com/cryogen-project/cryogen-docs/pull/41