[hlship]

~ > time bb -e '(println "Hello World")' Hello World bb -e '(println "Hello World")' 0.01s user 0.03s system 18% cpu 0.212 total

bb is Babashka: a pre-compiled (using Graal), interpreted, scripting language version of Clojure.

In terms of realistic work:

~/workspaces/github/pedestal/tests > time clj -X:test {:in user/eval2321, :line 13, :thread "main", :dev-mode? false}

Running tests in #{"test"}

...

Testing io.pedestal.test-test

Ran 391 tests containing 1180 assertions. 0 failures, 0 errors. clj -X:test 30.15s user 2.04s system 203% cpu 15.838 total ~/workspaces/github/pedestal/tests > java -version openjdk version "23.0.2" 2025-01-21 OpenJDK Runtime Environment Corretto-23.0.2.7.1 (build 23.0.2+7-FR) OpenJDK 64-Bit Server VM Corretto-23.0.2.7.1 (build 23.0.2+7-FR, mixed mode, sharing)

That's on my Intel MacBook Pro. Pedestal's test suite loads a good amount of Java classes and Clojure namespaces.

To make things faster, there's ahead-of-time compilation (which basically captures the read-eval-create-bytecode part of loading a Clojure namespace as Java .class files that can be packaged into your app).