title: Google Maps is very slow
body: <p>I am trying to use Google Maps Api 3. I have almost 1300 points to show as markers. When I want to place these markers on map, it takes more than 10 seconds also zooming in and zooming out becomes really very hard. Even, after a some point, browser says there is no enough memory. I tried to use markerclusterer as adviced <a href="https://developers.google.com/maps/documentation/javascript/marker-clustering" rel="nofollow noreferrer">here</a> but the result is same. </p>
  
  <p>What can be the problem and how can I make this process faster?</p>