Stumbled across this excellent article about a JRuby + OpenJDK upgrade done by the Looker team (now Google's Looker Studio). We always tell users: want faster JRuby? Upgrade! This shows it in real numbers on a very large app. Proud to be able to show such a great success story!
https://medium.com/looker-engineering/turning-looker-up-to-11-daa00de88d4c