[Neo4j] run dfs on large dataset using neo4j is slow? or what is the problem with the code i am referring?

[TC]

Hi, I'm running a large graph node. 265214 nodes and 420045 edges.
I'm using the traversal example from neo4j doc.
public String knowsTraverserforward( Node node )
    {
        String output = "";
        // START SNIPPET: knowslikestraverser
        for ( Path position : db.traversalDescription()
                .depthFirst()
                .relationships( Rels.KNOWS, Direction.OUTGOING )
        //        .evaluator( Evaluators.toDepth(10) )
                .traverse( node ) )
        {
            output += position + "\n";
        }
        // END SNIPPET: knowslikestraverser
        return output;
    }

while i when i set the depth like 10, it take little time to output
now i delete the depth assumption, it take so long time to produce the 
output (more than 20 minutes)
i using eclipse on windows to do this code. 
is there something with my attempt?
Thanks

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