ZeeMaps supports marker “clustering” for improved performance. Clustering groups nearby markers into “clusters” and shows them as small blue circles, instead of the individual marker. Since the map display does not have to draw as many markers, the display performs faster, with less visual clutter.
In the past we’ve automatically added marker clustering to maps with more than 100 markers. Over the years, Google Maps marker performance has improved, and 100 markers is no longer a good threshold. In fact, with our progressive display technology, even 1000’s of markers is okay to display without clustering.
From now on, therefore, we are removing the automatic clustering of markers. If you want to cluster markers for improved visualization or speed, please use the “Settings -> Markers -> Group nearby markers” menu command to enable marker clustering on your map.
We’ve revised the settings such that when you create a map and it reaches 400 markers, the markers will automatically be set to small markers. When the map reaches 1000 markers, the map will automatically be set to use clustering. You can undo these effects using the Settings -> Markers menu item.
With this new mechanism maps with even less than 100 markers can enabling clustering to reduce visual clutter.