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Dragging google maps 3 with custom overlays causes VERY HUGE LAG

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I started using version 3 of google maps api, but there is a BIG problem.

When I create more than 20-30 custom overlays on the map AND try to drag the map with the mouse there is VERY HUGE lag.

When I use the build in control to pan the map there is NO lag.

Any idea what is happening? When I use version 2 the lag appears after adding more than 200 custom overlays. Version 3 start lagging with 20-30 only. This does not happen with browsers like chrome and internet explorer

P.S. By custom overlay I mean subclassing OverlayView.

version 3 example: http://46.233.14.168:8080/GoogleMapsTest/testPage.jsp

version 2 example: http://46.233.14.168:8080/GoogleMapsTest/testPage2.jsp

I started using version 3 of google maps api, but there is a BIG problem. When I create more than 20-30 custom overlays on the map AND try to drag the map with the mouse there is VERY HUGE lag. When I use the build in control to pan the map there is NO lag. Any idea what is happening? When I use version 2 the lag appears after adding more than 200 custom overlays. Version 3 start lagging with 20-30 only. This does not happen with browsers like chrome and internet explorer P.S. By custom overlay I mean subclassing OverlayView. version 3 example: http://46.233.14.168:8080/GoogleMapsTest/testPage.jsp version 2 example: http://46.233.14.168:8080/GoogleMapsTest/testPage2.jsp