From the webpage:
Graph-tool is an efficient Python module for manipulation and statistical analysis of graphs (a.k.a. networks). Contrary to most other python modules with similar functionality, the core data structures and algorithms are implemented in C++, making extensive use of template metaprogramming, based heavily on the Boost Graph Library. This confers it a level of performance that is comparable (both in memory usage and computation time) to that of a pure C/C++ library.
A new version of graph-tool is available for downloading!
A graph based analysis of the 2016 U.S. Budget is going to require all the speed you can muster!
Enjoy!