Hello, first of all sorry for my English..

I'm developing a map with millons of markers and I readed about Marker
clusterer of the Api V3 but I see that the markers are loaded (not
shown but preloaded) and if I have a millon of markers the maps takes
too long time..

So I need to get the focused LatLong (that I can do it) and so get
markers according to the focused zone..
My problem is that if I load 1000 markers and next I drag the map, the
only solution I get in mind is to clear all markers and redraw them..
and when I move the map a few metters I have the same operation over
and over.. clear and redraw tasting a lot of bandwith..

Do you know any way to clear only markers that are not on a ratio of
seen (focused) zone with gmap api javascript or PHP ?..

Thanks a lot to all!

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