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This question already has an answer here:

I would like to know the way to overlay 50000 markers on open layers. and would like to know how much can openlayers support?

Thanks in Advance.

Lakshmi Ramya.

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

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Also have a look at this question for how to do server-side clustering:… – Devdatta Tengshe Feb 28 '13 at 6:49

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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