~/projects/jruby ➔ jruby -X-C -rbenchmark -e "10.times { puts Benchmark.measure { 10000.times { class A; def foo; 5 + 5; end; end; aa = A.new; def aa.stuff; 6 + 6; end } } }"
  0.443000   0.000000   0.443000 (  0.393000)
  0.284000   0.000000   0.284000 (  0.284000)
  0.278000   0.000000   0.278000 (  0.278000)
  0.278000   0.000000   0.278000 (  0.278000)
  0.274000   0.000000   0.274000 (  0.274000)
  0.279000   0.000000   0.279000 (  0.279000)
  0.280000   0.000000   0.280000 (  0.280000)
  0.278000   0.000000   0.278000 (  0.278000)
  0.278000   0.000000   0.278000 (  0.278000)
  0.276000   0.000000   0.276000 (  0.276000)

~/projects/jruby ➔ jruby --server -X-C -rbenchmark -e "10.times { puts Benchmark.measure { 10000.times { class A; def foo; 5 + 5; end; end; aa = A.new; def aa.stuff; 6 + 6; end } } }"
  1.035000   0.000000   1.035000 (  0.980000)
  0.559000   0.000000   0.559000 (  0.560000)
  0.530000   0.000000   0.530000 (  0.530000)
  0.528000   0.000000   0.528000 (  0.528000)
  0.531000   0.000000   0.531000 (  0.531000)
  0.595000   0.000000   0.595000 (  0.595000)
  0.537000   0.000000   0.537000 (  0.537000)
  0.531000   0.000000   0.531000 (  0.530000)
  0.595000   0.000000   0.595000 (  0.595000)
  0.534000   0.000000   0.534000 (  0.534000)