Performance - World Cup Network
  This example shows the performance of vis with a larger network. The edges in
  particular (~9200) are very computationally intensive
  to draw. Drag and hold the graph to see the performance difference if the
  edges are hidden.
  
  We use the following physics configuration: 
  {barnesHut: {gravitationalConstant: -80000, springConstant: 0.001,
    springLength: 200}}