Google Marker Manager

When you add a large number of markers to a Google map it tends to slow down the rendering of the map display as well as making it harder to visualize due to all of the clutter. To get around this problem, Google has implemented a marker manager. This utility helps resolve both of these issues, allowing an efficient display of any large number of markers within the same map and also the ability to specify a given zoom level for the markers to appear at.

The Google marker manager offloads management of markers registered with the utility, keeping track of which markers are visible at certain zoom levels within the current view, and passing only these markers to the map for drawing purposes. It monitors the map's current view ports and zoom levels, dynamically adding or removing markers from the map as they become active. By allowing markers to specify the zoom levels at which they display themselves, developers can implement marker clustering. Such management can greatly speed up map rendering and reduce visual clutter. So now you can have a highly informative online map that still is pleasing to the viewer’s eyes and will also be less confusing.