According to the JRuby dev repo[0] the truffle branch[1] was merged into master and blog[2], Truffle may be bringing cexts back and higher performance to JRuby. If this could be ship production-worthy as default, it would be awesomesauce!

0. https://github.com/jruby/jruby

1. truffle-head possibly took its place as most dev seems to be on master

2. http://blog.jruby.org/2014/01/truffle_graal_high_performance...