Google Maps mash-ups can suffer performance problems when trying to display a large number of markers at any one time. In order to avoid performance issues when displaying hundreds of markers some kind of clustering needs to be implemented. Today Click2Map have released their clustering solution.
This new feature from Click2Map is demonstrated in the video below:
Click2Map is an easy to use application that lets you create, manage and publish Google Maps without any knowledge of programming. Now, with the introduction of this clustering solution, you can build maps with thousands of markers.