Hello, I have tested ruby 1.9 and notice a speedup of 2 to 3 when running my app: http://www.discretizer.org I''m very happy and just had to change a few things (an atan that went Complex and maybe something more). Regards Bj?rn Bergqvist www.discretizer.org _________________________________________________________ One test I made with a normal test case (read file, and export mesh): ruby 1.8.7p174 -Real time 1m33.665s 1m33.733s 1m33.649s ruby 1.9.1-p243 -Real time 0m46.481s 0m41.844s 0m41.830s