Hello, 

I use graph-tool to do some routing tasks over graphs ranging from 1M to 10M edges. To search shortest paths might be quite time consuming. Hence, I wonder if it might be a good idea to try to implement Hierarchical Contractions [1] in graph tool. 

What is your opinion about it ? 

Regards,
Fran 


[1] https://en.wikipedia.org/wiki/Contraction_hierarchies