title: Vis.js not showing graph when many nodes are added
body: <p>I am making a web app to show relationships between items using <code>Vis.js</code>, everything works perfectly fine until I get to the point where I need to display ~260 nodes with ~1200 edges between them.</p>
  
  <p>Once I get to that amount of nodes, the graph just shows a blank space and a blue line, nothing else. As soon as I try to zoom it, the line disappears and it's all white.</p>
  
  <p>When I look at the position of the nodes I can see that many of them are in negative or very big <code>x, y</code> positions (generally -300 for x and around 478759527705558300000 for y).</p>
  
  <p>I have tried, to no avail, to disable physics. The graph is in hierarchichal mode, with levels manually set in the code, but the levels are correct.</p>
  
  <p>Network options (the <code>improvedLayout</code> option was just a possibility I found on the internet; it works just the same if I remove it):</p>
  
  <pre><code>    var options = {
          layout: {
              improvedLayout: false,
              hierarchical: {
                  direction: direction,
                  sortMethod: "directed"
              }
          }
      }
  </code></pre>
  
  <p>Screenshot:
  <a href="https://i.stack.imgur.com/i18bz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/i18bz.png" alt="Screenshot"></a></p>