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I would like to know the way to overlay 50000 markers on OpenLayers, and would like to know how many OpenLayers can support?

marked as duplicate by whuber Feb 28 '13 at 6:58

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According to your question :

Browsers can't handle moving around a DOM with more than a few hundred elements at once. I highly recommend figuring out a way to limit yourself to under 500 markers (Firefox) or 50 markers (IE6).

Please go though FAQ's

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