Any thoughts about making it able to use more then one core?
It uses 25% of my 4 core processor, so I guess it's not able to use more then one core.
I'm not sure how hard it is to make, but it would greatly speed up whole process.
Using CUDA could make it even 10 (or more) times faster for nVidia users.

Yes, when it was developed all CPUs where single core. I'm planning a multicore feature but this is not so easy to code on an existing project. I know the CUDA tools too, was thinking to implement even those. They are very interesting, can be even more than 10 times faster.

The latest Beta will uses now all your 4 cores

I just build my first multicore PC, with a cool quad core