JRuby is in wide deployment at hundreds or thousands of businesses across every industry. We generally run real-world apps much faster than CRuby (lower latency

JRuby is in wide deployment at hundreds or thousands of businesses across every industry. We generally run real-world apps much faster than CRuby (lower latency, better use of CPU and memory) and are especially good at big data and high concurrency applications. JRuby remains the only alternative Ruby to see large-scale production deployment.