Zero:rubinius david$ time bin/rbx -XJ -Xjit.inline.blocks ~/mandel.rb > rbx-jit.ppm real 1m2.750s user 1m1.831s sys 0m2.580s Zero:rubinius david$ rvm 1.9.1 Zero:rubinius david$ time ruby ~/mandel.rb > ruby-1.9.1.ppm real 0m19.200s user 0m18.372s sys 0m0.136s Zero:rubinius david$ diff rbx-jit.ppm ruby-1.9.1.ppm Zero:rubinius david$