I'd wager that a bigger goal is being able to take part of the Java ecosystem. That said, we really need to know which flags he's running Jruby with - and whic

I'd wager that a bigger goal is being able to take part of the Java ecosystem. That said, we really need to know which flags he's running Jruby with - and which The internet tells me that you achieve better performance with -server at the expense of a bigger start-up time penalty. Anecdotally, it takes a while for the JIT compiler to find the hotspots in your code and optimize them away. All of this will depend on how Jruby-rails keeps code in memory, yadda yadda. Someone who actually has used Java/Jruby recently can chime in with more details.