Yeah, I&#x27;m oversimplifying. However, compared to MRI, the JVM starts up quite slowly. Pile on JRuby et al and you end up with an even slower time to go. I think the JRuby people have been very focused on feature parity, interop, and bug fixes so I&#x27;m not sure they&#x27;ve prioritized startup time. For now, I&#x27;m happy with that, I don&#x27;t restart my app that often, basically only on deploys.