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Message: [QUOTE="Dominik Bathon, post: 4522581"] Hi, Here are some numbers. Running this code: max =3D 2000 z =3D x =3D 0 while (x+=3D1) <=3D max y =3D 0 while (y+=3D1) <=3D max z =3D (x+y-z) % 32000 end end takes about 5.5s in plain Ruby 1.8.4 (on my machine). Compiling it with Ruby2CExtension (latest version, all optimizations = turned on) and then running it takes about 0.9s. One of the optimizations is to bypass rb_call and calling the C function= s = of those methods (almost) directly (when possible). If this optimization is turned off then running the compiled code takes = = about 3.1s. These additional 2.2s are all spent for method dispatch. Plain Ruby spends at least the same time for method dispatch, so Ruby = spends at least 40% of the time doing method dispatch (in this case). I hope that helps, Dominik [/QUOTE]