Explore the benefits of scaling Rails applications with JRuby in this RailsConf 2022 talk. Discover how JRuby, now supporting Ruby 3.1, offers world-class garbage collection, native JIT compilation, and true parallel threading. Learn to reduce latency and resource costs by hosting a single JRuby process for concurrent users. Gain insights into JRuby's compatibility, JVM benefits, installation process, and deployment strategies for Rails applications. Examine performance improvements in Active Record operations and understand caveats and future improvements. Uncover why JRuby is the only alternative Ruby implementation deployed at scale, powering mission-critical applications worldwide.