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JRuby is also an amazing piece of technology. There are plenty of instances where you can change the engine and get all the performance enhancements of the JVM whilst the flexibility of Ruby.

Note: I have no idea if ZenPayroll uses or has considered JRuby. This comment is specifically about improving the performance of Ruby.

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While not JRuby, the big advantage of a JVM-based language is access to the Java ecosystem.

I built a system where Python was a beautiful fit and ran it on Jython so that I could use JDBC drivers to access an Oracle database. From another comment, it sounds like ZenPayroll came to the same conclusion with Ruby/JRuby.

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