Memory optimisations

[tadjik1]

Hey @alexisfacques , thanks a lot for such a nice library!
In my experiments, I have around 50-60k transactions and the algorithm stops working after some time, the process crashes with an OOM error. I have 16GB of RAM and it is all getting utilized by the library.
I understand that it's the nature of this algorithm to be inefficient in memory, but do you see any chances to make it work on a regular laptop? Some kinds of tweaks or optimizations maybe. Or use some external tools (such as databases, and file systems) for storing temporary results after each step.