for nbody 500000 on my i5-9300H CPU @ 2.40GHz

  - 487.41 millis / 2364 kb ram for luajit -joff
  - 770.17 millis / 41712 kb ram for bolt

  770.17 / 487.41 ~~ 1.58 cpu, not 2x, but not 15% either
  41712 / 2364 ~~ 17.64 ram