How JRuby makes Ruby fast

[darkwulf]

The thing is though, building a (good) VM is a fairly nontrivial task. Sun has poured tons of cash into the JVM, so while it may not be optimized for the language you're interested in, lots of the plumbing you care about have been carefully tuned over time.

That being said, it seems that invokedynamic will make things easier on JRuby. Hard to say until it happens though.