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Re:Introducing Rubinius X by bhauer on Tuesday October 15, 2013 @12:30PM (#6554293)
JRuby, at least in my experience, has not yet delivered performance in line with my expectations of a JVM-hosted language.

In my opinion, performance is by a huge margin the chief reason I do not begin new projects on Ruby. I would rather defer performance tuning efforts and scale complexity until much later in projects' life, rather than immediately following launch when I have 100 concurrent users hitting the application.

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