google maps

I have developed an application in GWT which allows users to visualize a large graph.  The application has a few requirements:

1.) Display about 5000 nodes & edges

2.) add or delete nodes/edges from the graph

3.) click nodes/edges on the graph & execute a custom callback function

4.) Provide a blank overlay behind the markers so it is not obvious that this is a Google Map

I built this using gwt-maps-v2, but it performs very slugglishly.  Load time is slow, the elements take a while to reappear on pan/zoom, and the blank background flickers on pan/zoom.  I have seen solutions for this using javascript such as GMarker and MarkerLIght.  

Is there anything similar for GWT?

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