Merging multiple graphs?

Hi.
Thanks for this awesome library! I was able to visualize some pretty big datasets (5-10 millions of nodes and 15 millions of links).

So I tried to increase the number of nodes(somewhere around 50 millions).
I have 32GB of RAM btw.

My current issue is that creating a ngraph.graph instance is a bit difficult. I mean because of such a large dataset my PC memory gets full very fast.

So I was wondering if there is a way to save several ngraph.graph instances into files and then merge them (so the result next can be processed with ngraph.tobinary).
Or maybe there is another approach to this issue?

Thanks!

Start by reviewing how ngraph.graph instances are created and how ngraph.tobinary handles graph data. Determine whether merging serialized graph instances is a defined, feasible change; done would require a confirmed approach for processing the stated large datasets and clear documentation of its limits.

Written by the indexing model from the issue text.