Twitter could have been such a nice ActiveMQ/Jetty+Cometd Java application I think. And probably run on half the amount of hardware that they have now. Rails is

Twitter could have been such a nice ActiveMQ/Jetty+Cometd Java application I think. And probably run on half the amount of hardware that they have now. Rails is not very efficient when it comes to resources. I have re-implemented Ruby/Rails code that runs faster and in 3 times less hardware on Java. Closer to the metal. Better usage of OS services.