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Interesting numbers. I have been out of the Java world for a few years and I’m unfamiliar with GraalVM but I’m curious how compatible it is with Oracle Java or OpenJDK.

Of course for small scale stuff like a QuickSort implementation, JVM starts are fast-ish, but for a nontrivial service, library load times during boot can balloon quickly depending on your build discipline.

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incredibly compatible, albeit with some limitations. The compiler is quite aggressive, so e.g. you can't do reflection on "any" class, you just have to tell the compiler what you are going to use at runtime (so called "closed-world assumption"). Also most initialization code is forced to run at "compile-time" to keep boot time low. Pretty incredible piece of code.

What's the license on it?

I'm looking at a project that makes "The main benefits of doing so is to enable polyglot applications (e.g., use Java, R, or Python libraries)" sound attractive.

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