http://gmaps-utility-library.googlecode.com/svn/trunk/markerclusterer/1.0/examples/speed_test_example.html
How it works:
* The
MarkerClusterer will group markers into clusters according to* their distance from a cluster's center. When a marker is added,
* the marker cluster will find a position in all the clusters, and
* if it fails to find one, it will create a new cluster with the marker.
* The number of markers in a cluster will be displayed
* on the cluster marker. When the map viewport changes,
*
MarkerClusterer will destroy the clusters in the viewport* and regroup them into new clusters.
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