Optimized build.

The last build of the KirstenViewer was not as fast as expected, missed to make a release build with optimization. I usually build with Henri's scripts making this for me. But as this code came in an other form that was not possible an I goofed. I had the feeling it was not as quick as I expected but never got the time to make clean test. yesterday I did, the numbers was so bad I had to do something. Lime add optimization flags. This runs well on my AMD-64, not tested on any intel props, it might not work as well there. New build here, code diff against 1.21.6 here. Full code is here and follow the viewer at her blog.