Can startup time be improved?

I understand that this is a hard problem, and that Leiningen isn't any better at this, but I think the major deal-breaker for using boot CLI scripts is the SLOW startup time. I've tried using tools like [drip](https://github.com/ninjudd/drip) to help improve this, but drip doesn't help at all since the main source of the slowdown is not JVM startup time but loading the Clojure jars. I wrote a persistent REPL tool called [quick-clojure](https://github.com/benwbooth/quick-clojure) to try and deal with this, but running on a cached JVM has its own set of issues. I have no idea how to solve this, but I thought it was worth bringing up.

Start with the boot CLI startup path and compare the reported slowdown from loading Clojure jars against JVM startup, using the linked drip and quick-clojure experiments as context. Define a measurable startup-time target and identify a reproducible benchmark; done requires an agreed approach and evidence that startup improves without the cached-JVM issues described.

Written by the indexing model from the issue text.