title: Google Maps V3 rendering over 1 million markers (in a reasonable time)
body: <p>I have recently created a Google Map using V3 of the API (latest version).  One of my requirements is that I am able to render over 1 million markers (in a reasonable time). A reasonable time would be under 15 seconds. </p>
  
  <p>I know that it is fairly crazy to render all 1 million markers at once which is why I have investigated performance options. One of the options I came across and utilized is the MarkerClusterer: <a href="https://developers.google.com/maps/articles/toomanymarkers" rel="noreferrer">https://developers.google.com/maps/articles/toomanymarkers</a></p>
  
  <p>However, I am now starting to see performance issues when testing the MarkerClusterer with over 100,000 markers as it is taking a long time to render the map and markers (1 min+).  Eventually, I have managed to make the page crash with around 200,000 markers.  </p>
  
  <p>Is there any way to improve the performance of the map when using this many markers?</p>
  
  <p>Thanks in advance for any help.</p>