Building big graph takes to much time

[Maryia-M]

Hi, I'm trying to run hipster4j on different planar graphs (100, 1000, 10000, 100000, 1000000 vertices). But it takes to much time even to build graph (much more than running A* algorithm from this library on this graph) starting from 10000 vertices. Here is code how I build graph:

GraphBuilder<String, Double> gb = GraphBuilder.<String, Double>create();

for (Edge edge : g.edges) {
	gb.connect(edge.firstId).to(edge.secondId).withEdge(edge.weight);
}
HipsterGraph<String, Double> graph = gb.createUndirectedGraph();

Maybe there are some faster ways to do this?