Right, but still, I'm wondering if something else isn't going on. Like artifact size, having to pull Clojure, Spec, etc.
For example, I'd assume the Python, JS, Ruby, and Java libs are already bundled inside the Lambda runtime. So they don't have to download these and pay the download and decompress cost. Which might not be true of Clojure, and maybe why it adds so much start time?
Native image does tree-shaking for example of the entire byte code, and will also reduce artifact size in that respect most likely.
Not saying the data is wrong, just it doesn't seem we have a true root cause here, because class-loading on old computers still isn't that slow. On my 2013 Dell XPS I hello world clojure app take under 2 second to start for example.