So, now that we’re using compose on the desktop (JVM), we have the usual Java problem of first-time class loading taking a long time, which looks bad in a desktop app. Is there a good solution for this? So far my best is to load all the classes given by Guava’s

ClassPath.allClasses

, but that seems a bit much.

This isn't necessarily something with an instant turnaround time, but Project Leyden is relevant to what you are saying: https://openjdk.java.net/projects/leyden/

Until then, is there way to do a “dry-run” of a

@Composable

function, so it loads all the classes it needs?

Sort of. Look at AppCDS.

Hmm, interesting

You might be interested in of even GraalVM/Native-image .