Two questions that have been discussed, but still are unclear for me:

- What is currently the best factor value? 1.5? I'm using 2.0, which takes almost as twice computing time than 1.5.

- I have tried several mem values over 256 Mb (300, 310, 330 Mb), but it always allocates ~252000 kB for stage 2. I think this is beacuse there are some kind of "chunks". Couldn't this be improved?

Thanks!